diff --git a/backend/data_layer/activity_metrics.py b/backend/data_layer/activity_metrics.py
index ebb1731..ee78809 100644
--- a/backend/data_layer/activity_metrics.py
+++ b/backend/data_layer/activity_metrics.py
@@ -330,24 +330,30 @@ def calculate_training_frequency_7d(profile_id: str) -> Optional[int]:
         return int(row['session_count']) if row else None
 
 
-def calculate_quality_sessions_pct(profile_id: str) -> Optional[int]:
-    """Calculate percentage of quality sessions (good or better) last 28 days"""
+def calculate_quality_sessions_pct(profile_id: str, days: int = 28) -> Optional[int]:
+    """Anteil qualitativ guter Sessions (quality_label) im Zeitfenster ``days``."""
+    if days < 1:
+        days = 28
+    cutoff = (datetime.now() - timedelta(days=days)).strftime("%Y-%m-%d")
     with get_db() as conn:
         cur = get_cursor(conn)
-        cur.execute("""
+        cur.execute(
+            """
             SELECT
                 COUNT(*) as total,
                 COUNT(*) FILTER (WHERE quality_label IN ('excellent', 'very_good', 'good')) as quality_count
             FROM activity_log
             WHERE profile_id = %s
-              AND date >= CURRENT_DATE - INTERVAL '28 days'
-        """, (profile_id,))
+              AND date >= %s
+            """,
+            (profile_id, cutoff),
+        )
 
         row = cur.fetchone()
-        if not row or row['total'] == 0:
+        if not row or row["total"] == 0:
             return None
 
-        pct = (row['quality_count'] / row['total']) * 100
+        pct = (row["quality_count"] / row["total"]) * 100
         return int(pct)
 
 
@@ -495,11 +501,12 @@ def calculate_ability_balance_mobility(profile_id: str) -> Optional[int]:
 # A5: Load Monitoring (Proxy-based)
 # ============================================================================
 
-def calculate_proxy_internal_load_7d(profile_id: str) -> Optional[int]:
+def calculate_proxy_internal_load_window(profile_id: str, days: int = 7) -> Optional[float]:
     """
-    Calculate proxy internal load (last 7 days)
-    Formula: duration × intensity_factor × quality_factor
+    Proxy-Last über die letzten ``days`` Kalendertage (gleiche Formel wie bisher nur für 7 Tage).
     """
+    if days < 1:
+        days = 7
     intensity_factors = {'low': 1.0, 'moderate': 1.5, 'high': 2.0}
     quality_factors = {
         'excellent': 1.15,
@@ -512,12 +519,15 @@ def calculate_proxy_internal_load_7d(profile_id: str) -> Optional[int]:
 
     with get_db() as conn:
         cur = get_cursor(conn)
-        cur.execute("""
+        cur.execute(
+            """
             SELECT duration_min, hr_avg, rpe
             FROM activity_log
             WHERE profile_id = %s
-              AND date >= CURRENT_DATE - INTERVAL '7 days'
-        """, (profile_id,))
+              AND date >= CURRENT_DATE - (%s::int * INTERVAL '1 day')
+            """,
+            (profile_id, days),
+        )
 
         activities = cur.fetchall()
 
@@ -554,7 +564,12 @@ def calculate_proxy_internal_load_7d(profile_id: str) -> Optional[int]:
             load = float(duration) * intensity_factors[intensity] * quality_factors.get(quality, 1.0)
             total_load += load
 
-        return int(total_load)
+        return float(total_load)
+
+
+def calculate_proxy_internal_load_7d(profile_id: str) -> Optional[float]:
+    """Letzte 7 Tage — Kompatibilität mit Platzhaltern / älteren Aufrufern."""
+    return calculate_proxy_internal_load_window(profile_id, 7)
 
 
 def calculate_monotony_score(profile_id: str) -> Optional[float]:
@@ -1222,3 +1237,301 @@ def get_training_parameters_ki_glossary_data(profile_id: str) -> Dict[str, Any]:
         "parameters": rows,
         "meta": {"count": len(rows), "scope": "global_active_catalog"},
     }
+
+
+# ============================================================================
+# Chart payloads (Phase 0c / Layer 1) — gemeinsam mit charts-Router und Layer-2b-Bundles
+# ============================================================================
+
+
+def build_training_volume_chart_payload(profile_id: str, weeks: int) -> Dict[str, Any]:
+    """
+    Wöchentliches Trainingsvolumen (Minuten) — gleiche Logik wie GET /api/charts/training-volume.
+    """
+    if weeks < 4:
+        weeks = 4
+    if weeks > 52:
+        weeks = 52
+
+    cutoff = (datetime.now() - timedelta(weeks=weeks)).strftime("%Y-%m-%d")
+
+    with get_db() as conn:
+        cur = get_cursor(conn)
+        cur.execute(
+            """SELECT
+                DATE_TRUNC('week', date) as week_start,
+                SUM(duration_min) as total_minutes,
+                COUNT(*) as session_count
+               FROM activity_log
+               WHERE profile_id=%s AND date >= %s
+               GROUP BY week_start
+               ORDER BY week_start""",
+            (profile_id, cutoff),
+        )
+        rows = cur.fetchall()
+
+    if not rows:
+        return {
+            "chart_type": "bar",
+            "data": {"labels": [], "datasets": []},
+            "metadata": {
+                "confidence": "insufficient",
+                "data_points": 0,
+                "message": "Keine Aktivitätsdaten vorhanden",
+            },
+        }
+
+    labels = [row["week_start"].strftime("KW %V") for row in rows]
+    values = [safe_float(row["total_minutes"]) for row in rows]
+
+    confidence = calculate_confidence(len(rows), weeks * 7, "general")
+
+    return {
+        "chart_type": "bar",
+        "data": {
+            "labels": labels,
+            "datasets": [
+                {
+                    "label": "Trainingsminuten",
+                    "data": values,
+                    "backgroundColor": "#1D9E75",
+                    "borderColor": "#085041",
+                    "borderWidth": 1,
+                }
+            ],
+        },
+        "metadata": serialize_dates(
+            {
+                "confidence": confidence,
+                "data_points": len(rows),
+                "avg_minutes_week": round(sum(values) / len(values), 1) if values else 0,
+                "total_sessions": sum(row["session_count"] for row in rows),
+            }
+        ),
+    }
+
+
+def build_training_type_distribution_chart_payload(profile_id: str, days: int) -> Dict[str, Any]:
+    """
+    Trainingstyp-Verteilung — gleiche Logik wie GET /api/charts/training-type-distribution.
+    """
+    dist_data = get_training_type_distribution_data(profile_id, days)
+
+    if dist_data["confidence"] == "insufficient":
+        return {
+            "chart_type": "pie",
+            "data": {"labels": [], "datasets": []},
+            "metadata": {
+                "confidence": "insufficient",
+                "data_points": 0,
+                "message": "Keine Trainingstypen-Daten",
+            },
+        }
+
+    labels = [item["category"] for item in dist_data["distribution"]]
+    values = [item["count"] for item in dist_data["distribution"]]
+
+    colors = [
+        "#1D9E75",
+        "#3B82F6",
+        "#F59E0B",
+        "#EF4444",
+        "#8B5CF6",
+        "#10B981",
+        "#F97316",
+        "#06B6D4",
+    ]
+
+    return {
+        "chart_type": "pie",
+        "data": {
+            "labels": labels,
+            "datasets": [
+                {
+                    "data": values,
+                    "backgroundColor": colors[: len(values)],
+                    "borderWidth": 2,
+                    "borderColor": "#fff",
+                }
+            ],
+        },
+        "metadata": {
+            "confidence": dist_data["confidence"],
+            "total_sessions": dist_data["total_sessions"],
+            "categorized_sessions": dist_data["categorized_sessions"],
+            "uncategorized_sessions": dist_data["uncategorized_sessions"],
+        },
+    }
+
+
+def get_training_volume_two_week_delta(profile_id: str) -> Dict[str, Any]:
+    """
+    Trainingsminuten: letzte 7 Kalendertage vs. die 7 Tage davor (Fortschritt Volumen).
+    """
+    with get_db() as conn:
+        cur = get_cursor(conn)
+        cur.execute(
+            """
+            SELECT
+              COALESCE(SUM(duration_min) FILTER (WHERE date >= CURRENT_DATE - INTERVAL '7 days'), 0)::bigint AS last7,
+              COALESCE(SUM(duration_min) FILTER (
+                WHERE date < CURRENT_DATE - INTERVAL '7 days'
+                  AND date >= CURRENT_DATE - INTERVAL '14 days'), 0)::bigint AS prev7
+            FROM activity_log
+            WHERE profile_id = %s
+              AND date >= CURRENT_DATE - INTERVAL '14 days'
+            """,
+            (profile_id,),
+        )
+        row = cur.fetchone()
+    if not row:
+        return {"last7_min": 0, "prior7_min": 0, "delta_pct": None, "has_data": False}
+    last7 = int(row["last7"] or 0)
+    prev7 = int(row["prev7"] or 0)
+    if last7 == 0 and prev7 == 0:
+        return {"last7_min": 0, "prior7_min": 0, "delta_pct": None, "has_data": False}
+    delta_pct: Optional[float] = None
+    if prev7 > 0:
+        delta_pct = round((last7 - prev7) / float(prev7) * 100.0, 1)
+    return {
+        "last7_min": last7,
+        "prior7_min": prev7,
+        "delta_pct": delta_pct,
+        "has_data": True,
+    }
+
+
+def build_quality_sessions_chart_payload(profile_id: str, days: int) -> Dict[str, Any]:
+    """Qualitäts-Sessions vs. regulär — gleiche Logik wie GET /api/charts/quality-sessions."""
+    if days < 7:
+        days = 7
+    if days > 90:
+        days = 90
+    quality_pct = calculate_quality_sessions_pct(profile_id, days)
+    cutoff = (datetime.now() - timedelta(days=days)).strftime("%Y-%m-%d")
+
+    with get_db() as conn:
+        cur = get_cursor(conn)
+        cur.execute(
+            """SELECT COUNT(*) as total
+               FROM activity_log
+               WHERE profile_id=%s AND date >= %s""",
+            (profile_id, cutoff),
+        )
+        row = cur.fetchone()
+        total_sessions = row["total"] if row else 0
+
+    if total_sessions == 0:
+        return {
+            "chart_type": "bar",
+            "data": {"labels": [], "datasets": []},
+            "metadata": {
+                "confidence": "insufficient",
+                "data_points": 0,
+                "message": "Keine Aktivitätsdaten",
+            },
+        }
+
+    q = float(quality_pct or 0)
+    quality_count = int(round(q / 100.0 * total_sessions))
+    quality_count = max(0, min(quality_count, total_sessions))
+    regular_count = total_sessions - quality_count
+
+    return {
+        "chart_type": "bar",
+        "data": {
+            "labels": ["Qualitäts-Sessions", "Reguläre Sessions"],
+            "datasets": [
+                {
+                    "label": "Anzahl",
+                    "data": [quality_count, regular_count],
+                    "backgroundColor": ["#1D9E75", "#888"],
+                    "borderColor": "#085041",
+                    "borderWidth": 1,
+                }
+            ],
+        },
+        "metadata": {
+            "confidence": calculate_confidence(total_sessions, days, "general"),
+            "data_points": total_sessions,
+            "quality_pct": round(q, 1),
+            "quality_count": quality_count,
+            "regular_count": regular_count,
+        },
+    }
+
+
+def build_load_monitoring_chart_payload(profile_id: str, days: int) -> Dict[str, Any]:
+    """Tages-Load-Zeitreihe + ACWR — gleiche Logik wie GET /api/charts/load-monitoring."""
+    if days < 14:
+        days = 14
+    if days > 90:
+        days = 90
+
+    acute_load = calculate_proxy_internal_load_window(profile_id, 7)
+    chronic_load = calculate_proxy_internal_load_window(profile_id, 28)
+
+    acwr = (
+        (acute_load / chronic_load) if acute_load is not None and chronic_load and chronic_load > 0 else 0.0
+    )
+
+    cutoff = (datetime.now() - timedelta(days=days)).strftime("%Y-%m-%d")
+
+    with get_db() as conn:
+        cur = get_cursor(conn)
+        cur.execute(
+            """SELECT
+                date,
+                SUM(duration_min * COALESCE(rpe, 5)) as daily_load
+               FROM activity_log
+               WHERE profile_id=%s AND date >= %s
+               GROUP BY date
+               ORDER BY date""",
+            (profile_id, cutoff),
+        )
+        rows = cur.fetchall()
+
+    if not rows:
+        return {
+            "chart_type": "line",
+            "data": {"labels": [], "datasets": []},
+            "metadata": {
+                "confidence": "insufficient",
+                "data_points": 0,
+                "message": "Keine Load-Daten",
+            },
+        }
+
+    labels = [row["date"].isoformat() for row in rows]
+    values = [safe_float(row["daily_load"]) for row in rows]
+
+    al = float(acute_load) if acute_load is not None else 0.0
+    cl = float(chronic_load) if chronic_load is not None else 0.0
+
+    return {
+        "chart_type": "line",
+        "data": {
+            "labels": labels,
+            "datasets": [
+                {
+                    "label": "Tages-Load",
+                    "data": values,
+                    "borderColor": "#1D9E75",
+                    "backgroundColor": "rgba(29, 158, 117, 0.1)",
+                    "borderWidth": 2,
+                    "tension": 0.3,
+                    "fill": True,
+                }
+            ],
+        },
+        "metadata": serialize_dates(
+            {
+                "confidence": calculate_confidence(len(rows), days, "general"),
+                "data_points": len(rows),
+                "acute_load_7d": round(al, 1),
+                "chronic_load_28d": round(cl, 1),
+                "acwr": round(acwr, 2),
+                "acwr_status": "optimal" if 0.8 <= acwr <= 1.3 else "suboptimal",
+            }
+        ),
+    }
diff --git a/backend/data_layer/fitness_interpretation.py b/backend/data_layer/fitness_interpretation.py
new file mode 100644
index 0000000..114ec36
--- /dev/null
+++ b/backend/data_layer/fitness_interpretation.py
@@ -0,0 +1,283 @@
+"""
+KPI-Kacheln für Layer-2b Fitness-Dashboard (Issue #53).
+
+Ausgabe für KpiTilesOverview; ``keys`` = Platzhalter-Registry-Referenzen.
+"""
+
+from __future__ import annotations
+
+from typing import Any, Dict, List, Optional
+
+
+def _verdict(status: str) -> str:
+    if status == "good":
+        return "Gut"
+    if status == "warn":
+        return "Hinweis"
+    return "Achtung"
+
+
+def _minutes_status(minutes: Optional[int]) -> str:
+    if minutes is None:
+        return "warn"
+    if 150 <= minutes <= 300:
+        return "good"
+    if minutes < 150:
+        return "warn" if minutes >= 90 else "bad"
+    return "warn"
+
+
+def _quality_status(pct: Optional[int]) -> str:
+    if pct is None:
+        return "warn"
+    if pct >= 60:
+        return "good"
+    if pct >= 40:
+        return "warn"
+    return "bad"
+
+
+def _score_status(score: Optional[int]) -> str:
+    if score is None:
+        return "warn"
+    if score >= 70:
+        return "good"
+    if score >= 50:
+        return "warn"
+    return "bad"
+
+
+def _vo2_status(trend: Optional[float]) -> str:
+    if trend is None:
+        return "warn"
+    if trend > 0.5:
+        return "good"
+    if trend >= -0.5:
+        return "warn"
+    return "bad"
+
+
+def _vol_delta_status(delta_pct: Optional[float], prior7: int, last7: int) -> str:
+    if delta_pct is None:
+        if last7 > 0 and prior7 == 0:
+            return "good"
+        return "warn"
+    if delta_pct >= 5:
+        return "good"
+    if delta_pct >= -10:
+        return "warn"
+    return "bad"
+
+
+def build_fitness_progress_insights(
+    vol_delta: Dict[str, Any],
+    load_meta: Dict[str, Any],
+    quality_pct: Optional[int],
+) -> List[Dict[str, Any]]:
+    """
+    Kurz-Aussagen für die UI (Layer 2b), keine zweite Datenquelle.
+    """
+    out: List[Dict[str, Any]] = []
+    if vol_delta.get("has_data"):
+        last7 = int(vol_delta.get("last7_min") or 0)
+        prev7 = int(vol_delta.get("prior7_min") or 0)
+        d = vol_delta.get("delta_pct")
+        if d is not None:
+            sign = "+" if d > 0 else ""
+            body = (
+                f"Trainingsminuten letzte 7 Tage ({last7} min) vs. Vorwoche ({prev7} min): "
+                f"{sign}{d} %."
+            )
+        elif last7 > 0 and prev7 == 0:
+            body = f"Mehr Volumen als in der Vorwoche: zuletzt {last7} min (Vorwoche 0 min)."
+        else:
+            body = "Zu wenig Daten für einen Vorwochen-Vergleich."
+        out.append(
+            {
+                "key": "ins_vol_trend",
+                "tone": _vol_delta_status(
+                    float(d) if d is not None else None, prev7, last7
+                ),
+                "title": "Volumen-Trend",
+                "body": body,
+            }
+        )
+
+    acwr = load_meta.get("acwr")
+    st = load_meta.get("acwr_status")
+    if acwr is not None and isinstance(load_meta, dict) and load_meta.get("data_points", 0) > 0:
+        if st == "optimal":
+            tone = "good"
+            hint = "Akute zu chronischer Last (ACWR) liegt im oft empfohlenen Bereich (ca. 0,8–1,3)."
+        else:
+            tone = "warn"
+            hint = (
+                "ACWR außerhalb des häufig genannten Zielkorridors — bei anhaltender Belastung "
+                "Erholung oder Volumen prüfen (Proxy-Modell)."
+            )
+        out.append(
+            {
+                "key": "ins_acwr",
+                "tone": tone,
+                "title": "Belastungsverhältnis (ACWR)",
+                "body": f"Verhältnis akut (7 Tage) zu chronisch (28 Tage): {float(acwr):.2f}. {hint}",
+            }
+        )
+
+    if quality_pct is not None:
+        tone = "good" if quality_pct >= 60 else "warn" if quality_pct >= 40 else "bad"
+        out.append(
+            {
+                "key": "ins_quality",
+                "tone": tone,
+                "title": "Session-Qualität",
+                "body": f"{quality_pct} % der Sessions sind als «gut» oder besser eingestuft — Grundlage für progressive Belastung.",
+            }
+        )
+
+    return out
+
+
+def build_fitness_dashboard_kpi_tiles(
+    summary: Dict[str, Any],
+    minutes_7d: Optional[int],
+    quality_pct: Optional[int],
+    quality_window_days: int,
+    activity_score: Optional[int],
+    vo2_trend: Optional[float],
+    top_focus: Optional[Dict[str, Any]],
+    vol_delta: Optional[Dict[str, Any]] = None,
+) -> List[Dict[str, Any]]:
+    spw = summary.get("sessions_per_week")
+    try:
+        spw_f = float(spw) if spw is not None else None
+    except (TypeError, ValueError):
+        spw_f = None
+    spw_s = f"{spw_f:.1f}".replace(".", ",") if spw_f is not None else "—"
+
+    m_status = _minutes_status(minutes_7d)
+    q_status = _quality_status(quality_pct)
+    s_status = _score_status(activity_score)
+    v_status = _vo2_status(vo2_trend)
+
+    tiles: List[Dict[str, Any]] = []
+
+    if vol_delta and vol_delta.get("has_data"):
+        d = vol_delta.get("delta_pct")
+        last7 = int(vol_delta.get("last7_min") or 0)
+        prev7 = int(vol_delta.get("prior7_min") or 0)
+        if d is not None:
+            sign = "+" if float(d) > 0 else ""
+            v_s = f"{sign}{d:.1f} %".replace(".", ",")
+            sub = f"{last7} min vs. {prev7} min (7-Tage-Fenster)"
+        elif last7 > 0 and prev7 == 0:
+            v_s = "neu"
+            sub = f"{last7} min letzte Woche"
+        else:
+            v_s = "—"
+            sub = "Vergleich Vorwoche"
+        vd_st = _vol_delta_status(float(d) if d is not None else None, prev7, last7)
+        tiles.append(
+            {
+                "key": "volume_vs_prior_week",
+                "category": "Volumen vs. Vorwoche",
+                "icon": "📈",
+                "value": v_s,
+                "sublabel": sub,
+                "status": vd_st,
+                "verdict": _verdict(vd_st),
+                "hoverTop": "Fortschritt Trainingsminuten",
+                "hoverBody": "Letzte 7 Kalendertage vs. die 7 Tage davor (activity_log).",
+                "keys": ["training_minutes_week", "activity_summary"],
+            }
+        )
+
+    tiles.extend(
+        [
+            {
+                "key": "minutes_week",
+                "category": "Minuten (7 Tage)",
+                "icon": "⏱",
+                "value": f"{minutes_7d} min" if minutes_7d is not None else "—",
+                "sublabel": "WHO: 150–300 min/Woche",
+                "status": m_status,
+                "verdict": _verdict(m_status),
+                "hoverTop": "Summe Trainingsminuten (letzte 7 Tage)",
+                "hoverBody": "Gleiche Quelle wie Platzhalter training_minutes_week.",
+                "keys": ["training_minutes_week", "activity_score"],
+            },
+            {
+                "key": "sessions_per_week",
+                "category": "Sessions / Woche",
+                "icon": "📅",
+                "value": spw_s,
+                "sublabel": f"Fenster: {summary.get('days_analyzed', '—')} Tage",
+                "status": "good",
+                "verdict": "Gut",
+                "hoverTop": "Durchschnittliche Sessions pro Woche",
+                "hoverBody": "Aus activity_summary (activity_log im gewählten Zeitraum).",
+                "keys": ["activity_summary"],
+            },
+            {
+                "key": "quality_pct",
+                "category": "Qualitätssessions",
+                "icon": "✓",
+                "value": f"{quality_pct} %" if quality_pct is not None else "—",
+                "sublabel": f"Anteil «gut+» · {quality_window_days} Tage",
+                "status": q_status,
+                "verdict": _verdict(q_status),
+                "hoverTop": "Anteil Sessions mit guter Qualitätslabel-Klassifikation",
+                "hoverBody": "Entspricht quality_sessions_pct (Fenster wie gewählt).",
+                "keys": ["quality_sessions_pct"],
+            },
+            {
+                "key": "activity_score",
+                "category": "Activity-Score",
+                "icon": "🎯",
+                "value": str(activity_score) if activity_score is not None else "—",
+                "sublabel": "Ausrichtung an gewichteten Fokusbereichen",
+                "status": s_status,
+                "verdict": _verdict(s_status) if activity_score is not None else "Hinweis",
+                "hoverTop": "Gewichteter Score (0–100)",
+                "hoverBody": "Ohne gewichtete Aktivitäts-Fokusbereiche kein Score.",
+                "keys": ["activity_score"],
+            },
+            {
+                "key": "vo2_trend",
+                "category": "VO₂max-Trend",
+                "icon": "🫁",
+                "value": f"{vo2_trend:+.1f}" if vo2_trend is not None else "—",
+                "sublabel": "28-Tage-Trend (geschätzt)",
+                "status": v_status,
+                "verdict": _verdict(v_status) if vo2_trend is not None else "Hinweis",
+                "hoverTop": "Trend der VO₂max-Schätzung aus Aktivitätsdaten",
+                "hoverBody": "Wie vo2max_trend_28d im Data Layer.",
+                "keys": ["vo2max_trend_28d"],
+            },
+        ]
+    )
+
+    if top_focus:
+        prog = top_focus.get("progress")
+        prog_s = f"{prog} %" if prog is not None else "—"
+        w = top_focus.get("weight")
+        try:
+            w_s = f"{float(w):.0f} %" if w is not None else "—"
+        except (TypeError, ValueError):
+            w_s = "—"
+        tiles.append(
+            {
+                "key": "top_focus",
+                "category": "Schwerpunkt-Fokus",
+                "icon": "🔭",
+                "value": str(top_focus.get("label") or "—"),
+                "sublabel": f"Fortschritt {prog_s} · Gewicht {w_s}",
+                "status": "good",
+                "verdict": "Gut",
+                "hoverTop": "Höchstgewichteter Fokusbereich",
+                "hoverBody": "Aus focus_area_definitions + Nutzer-Gewichtungen.",
+                "keys": ["top_focus_area_name", "top_focus_area_progress"],
+            }
+        )
+
+    return tiles
diff --git a/backend/data_layer/fitness_viz.py b/backend/data_layer/fitness_viz.py
new file mode 100644
index 0000000..9c8ae03
--- /dev/null
+++ b/backend/data_layer/fitness_viz.py
@@ -0,0 +1,148 @@
+"""
+Layer 2b: Fitness-Hub — ein Bundle für die Aktivitäts-/Fitness-UI (Issue #53).
+
+Single Source: activity_metrics + dieselben Hilfsfunktionen wie Chart-Endpunkte A1/A2.
+"""
+
+from __future__ import annotations
+
+from typing import Any, Dict, Optional
+
+from db import get_db, get_cursor
+from data_layer.activity_metrics import (
+    build_load_monitoring_chart_payload,
+    build_quality_sessions_chart_payload,
+    build_training_type_distribution_chart_payload,
+    build_training_volume_chart_payload,
+    calculate_activity_score,
+    calculate_training_minutes_week,
+    calculate_quality_sessions_pct,
+    calculate_vo2max_trend_28d,
+    get_activity_summary_data,
+    get_training_volume_two_week_delta,
+)
+from data_layer.fitness_interpretation import (
+    build_fitness_dashboard_kpi_tiles,
+    build_fitness_progress_insights,
+)
+from data_layer.scores import get_top_focus_area
+
+
+def _iso(d: Any) -> Optional[str]:
+    if d is None:
+        return None
+    if hasattr(d, "isoformat"):
+        return d.isoformat()[:10]
+    return str(d)[:10]
+
+
+def _has_activity_entries(profile_id: str) -> bool:
+    with get_db() as conn:
+        cur = get_cursor(conn)
+        cur.execute(
+            "SELECT 1 FROM activity_log WHERE profile_id=%s LIMIT 1",
+            (profile_id,),
+        )
+        return cur.fetchone() is not None
+
+
+def _last_activity_date(profile_id: str) -> Optional[str]:
+    with get_db() as conn:
+        cur = get_cursor(conn)
+        cur.execute(
+            "SELECT MAX(date) AS d FROM activity_log WHERE profile_id=%s",
+            (profile_id,),
+        )
+        row = cur.fetchone()
+        if not row or row["d"] is None:
+            return None
+        return _iso(row["d"])
+
+
+def get_fitness_dashboard_viz_bundle(profile_id: str, days: int) -> Dict[str, Any]:
+    """
+    Bundle für Fitness-Übersicht: KPI-Kacheln + eingebettete Chart-Payloads (Chart.js-Format).
+
+    ``days``: Analysefenster für Zusammenfassung; >=9999 = lange Historie (max. 3650 Tage).
+    """
+    if not _has_activity_entries(profile_id):
+        return {
+            "confidence": "insufficient",
+            "has_activity_entries": False,
+            "message": "Noch keine Aktivitätsdaten",
+            "kpi_tiles": [],
+            "summary": {},
+            "progress_insights": [],
+            "volume_delta": {},
+            "charts": {},
+            "meta": {"layer_1": "activity_metrics", "layer_2b": "fitness_viz"},
+        }
+
+    all_history = days >= 9999
+    eff_days = 3650 if all_history else max(7, min(int(days), 3650))
+
+    summary = get_activity_summary_data(profile_id, eff_days)
+
+    weeks_vol = max(4, min(52, (min(eff_days, 365) + 6) // 7))
+    dist_days = min(90, max(7, min(eff_days, 365)))
+    load_days = min(90, max(14, min(eff_days, 365)))
+
+    volume_chart = build_training_volume_chart_payload(profile_id, weeks_vol)
+    type_chart = build_training_type_distribution_chart_payload(profile_id, dist_days)
+    quality_chart = build_quality_sessions_chart_payload(profile_id, dist_days)
+    load_chart = build_load_monitoring_chart_payload(profile_id, load_days)
+
+    quality_days = dist_days
+    quality_pct = calculate_quality_sessions_pct(profile_id, quality_days)
+    minutes_7d = calculate_training_minutes_week(profile_id)
+    activity_score = calculate_activity_score(profile_id)
+    vo2_trend = calculate_vo2max_trend_28d(profile_id)
+    top_focus = get_top_focus_area(profile_id)
+    vol_delta = get_training_volume_two_week_delta(profile_id)
+
+    kpi_tiles = build_fitness_dashboard_kpi_tiles(
+        summary,
+        minutes_7d,
+        quality_pct,
+        quality_days,
+        activity_score,
+        vo2_trend,
+        top_focus,
+        vol_delta,
+    )
+
+    load_meta = load_chart.get("metadata") or {}
+    if not isinstance(load_meta, dict):
+        load_meta = {}
+    progress_insights = build_fitness_progress_insights(vol_delta, load_meta, quality_pct)
+
+    conf = summary.get("confidence") or "medium"
+    if summary.get("activity_count", 0) == 0:
+        conf = "insufficient"
+
+    return {
+        "confidence": conf,
+        "has_activity_entries": True,
+        "days_requested": days,
+        "effective_window_days": eff_days,
+        "training_volume_weeks_used": weeks_vol,
+        "training_type_dist_days_used": dist_days,
+        "last_updated": _last_activity_date(profile_id),
+        "summary": summary,
+        "kpi_tiles": kpi_tiles,
+        "interpretation_tiles": [],
+        "progress_insights": progress_insights,
+        "volume_delta": vol_delta,
+        "charts": {
+            "training_volume": volume_chart,
+            "training_type_distribution": type_chart,
+            "quality_sessions": quality_chart,
+            "load_monitoring": load_chart,
+        },
+        "load_chart_days_used": load_days,
+        "meta": {
+            "layer_1": "activity_metrics",
+            "layer_2b": "fitness_viz",
+            "issue": "53-layer-2b-fitness",
+        },
+    }
diff --git a/backend/data_layer/recovery_chart_payloads.py b/backend/data_layer/recovery_chart_payloads.py
new file mode 100644
index 0000000..149ad26
--- /dev/null
+++ b/backend/data_layer/recovery_chart_payloads.py
@@ -0,0 +1,456 @@
+"""
+Chart.js-Payloads für Recovery (R1–R5) — gemeinsam mit routers/charts und recovery-dashboard-viz.
+
+Ausgelagert aus routers/charts.py (Issue 53 / Layer 1).
+"""
+
+from __future__ import annotations
+
+from datetime import datetime, timedelta
+from typing import Any, Dict
+
+from db import get_db, get_cursor
+from data_layer.recovery_metrics import (
+    calculate_hrv_vs_baseline_pct,
+    calculate_recovery_score_v2,
+    calculate_rhr_vs_baseline_pct,
+    calculate_sleep_debt_hours,
+    get_sleep_duration_data,
+    get_sleep_quality_data,
+)
+from data_layer.utils import calculate_confidence, safe_float, serialize_dates
+
+
+def build_recovery_score_chart_payload(profile_id: str, days: int) -> Dict[str, Any]:
+    if days < 7:
+        days = 7
+    if days > 90:
+        days = 90
+    current_score = calculate_recovery_score_v2(profile_id)
+
+    if current_score is None:
+        return {
+            "chart_type": "line",
+            "data": {"labels": [], "datasets": []},
+            "metadata": {
+                "confidence": "insufficient",
+                "data_points": 0,
+                "message": "Keine Recovery-Daten vorhanden",
+            },
+        }
+
+    cutoff = (datetime.now() - timedelta(days=days)).strftime("%Y-%m-%d")
+
+    with get_db() as conn:
+        cur = get_cursor(conn)
+        cur.execute(
+            """SELECT date, resting_hr, hrv
+               FROM vitals_baseline
+               WHERE profile_id=%s AND date >= %s
+               ORDER BY date""",
+            (profile_id, cutoff),
+        )
+        rows = cur.fetchall()
+
+    if not rows:
+        return {
+            "chart_type": "line",
+            "data": {
+                "labels": [datetime.now().strftime("%Y-%m-%d")],
+                "datasets": [
+                    {
+                        "label": "Recovery Score",
+                        "data": [current_score],
+                        "borderColor": "#1D9E75",
+                        "backgroundColor": "rgba(29, 158, 117, 0.1)",
+                        "borderWidth": 2,
+                        "tension": 0.3,
+                        "fill": True,
+                    }
+                ],
+            },
+            "metadata": {
+                "confidence": "low",
+                "data_points": 1,
+                "current_score": current_score,
+            },
+        }
+
+    labels = [row["date"].isoformat() for row in rows]
+    values = [min(100, max(0, safe_float(row["hrv"]) if row["hrv"] else 50)) for row in rows]
+
+    return {
+        "chart_type": "line",
+        "data": {
+            "labels": labels,
+            "datasets": [
+                {
+                    "label": "Recovery Score (proxy)",
+                    "data": values,
+                    "borderColor": "#1D9E75",
+                    "backgroundColor": "rgba(29, 158, 117, 0.1)",
+                    "borderWidth": 2,
+                    "tension": 0.3,
+                    "fill": True,
+                }
+            ],
+        },
+        "metadata": serialize_dates(
+            {
+                "confidence": calculate_confidence(len(rows), days, "general"),
+                "data_points": len(rows),
+                "current_score": current_score,
+                "note": "Score based on HRV proxy; true recovery score calculation in development",
+            }
+        ),
+    }
+
+
+def build_hrv_rhr_baseline_chart_payload(profile_id: str, days: int) -> Dict[str, Any]:
+    if days < 7:
+        days = 7
+    if days > 90:
+        days = 90
+    cutoff = (datetime.now() - timedelta(days=days)).strftime("%Y-%m-%d")
+
+    with get_db() as conn:
+        cur = get_cursor(conn)
+        cur.execute(
+            """SELECT date, resting_hr, hrv
+               FROM vitals_baseline
+               WHERE profile_id=%s AND date >= %s
+               ORDER BY date""",
+            (profile_id, cutoff),
+        )
+        rows = cur.fetchall()
+
+    if not rows:
+        return {
+            "chart_type": "line",
+            "data": {"labels": [], "datasets": []},
+            "metadata": {
+                "confidence": "insufficient",
+                "data_points": 0,
+                "message": "Keine Vitalwerte vorhanden",
+            },
+        }
+
+    labels = [row["date"].isoformat() for row in rows]
+    hrv_values = [safe_float(row["hrv"]) if row["hrv"] else None for row in rows]
+    rhr_values = [safe_float(row["resting_hr"]) if row["resting_hr"] else None for row in rows]
+
+    hrv_baseline = calculate_hrv_vs_baseline_pct(profile_id)
+    rhr_baseline = calculate_rhr_vs_baseline_pct(profile_id)
+
+    hrv_filtered = [v for v in hrv_values if v is not None]
+    rhr_filtered = [v for v in rhr_values if v is not None]
+
+    avg_hrv = sum(hrv_filtered) / len(hrv_filtered) if hrv_filtered else 50
+    avg_rhr = sum(rhr_filtered) / len(rhr_filtered) if rhr_filtered else 60
+
+    datasets = [
+        {
+            "label": "HRV (ms)",
+            "data": hrv_values,
+            "borderColor": "#1D9E75",
+            "backgroundColor": "rgba(29, 158, 117, 0.1)",
+            "borderWidth": 2,
+            "tension": 0.3,
+            "yAxisID": "y1",
+            "fill": False,
+        },
+        {
+            "label": "RHR (bpm)",
+            "data": rhr_values,
+            "borderColor": "#3B82F6",
+            "backgroundColor": "rgba(59, 130, 246, 0.1)",
+            "borderWidth": 2,
+            "tension": 0.3,
+            "yAxisID": "y2",
+            "fill": False,
+        },
+    ]
+
+    return {
+        "chart_type": "line",
+        "data": {"labels": labels, "datasets": datasets},
+        "metadata": serialize_dates(
+            {
+                "confidence": calculate_confidence(len(rows), days, "general"),
+                "data_points": len(rows),
+                "avg_hrv": round(avg_hrv, 1),
+                "avg_rhr": round(avg_rhr, 1),
+                "hrv_vs_baseline_pct": hrv_baseline,
+                "rhr_vs_baseline_pct": rhr_baseline,
+            }
+        ),
+    }
+
+
+def build_sleep_duration_quality_chart_payload(profile_id: str, days: int) -> Dict[str, Any]:
+    if days < 7:
+        days = 7
+    if days > 90:
+        days = 90
+    duration_data = get_sleep_duration_data(profile_id, days)
+    quality_data = get_sleep_quality_data(profile_id, days)
+
+    if duration_data["confidence"] == "insufficient":
+        return {
+            "chart_type": "line",
+            "data": {"labels": [], "datasets": []},
+            "metadata": {
+                "confidence": "insufficient",
+                "data_points": 0,
+                "message": "Keine Schlafdaten vorhanden",
+            },
+        }
+
+    cutoff = (datetime.now() - timedelta(days=days)).strftime("%Y-%m-%d")
+
+    with get_db() as conn:
+        cur = get_cursor(conn)
+        cur.execute(
+            """SELECT date, duration_minutes
+               FROM sleep_log
+               WHERE profile_id=%s AND date >= %s
+               ORDER BY date""",
+            (profile_id, cutoff),
+        )
+        rows = cur.fetchall()
+
+    if not rows:
+        return {
+            "chart_type": "line",
+            "data": {"labels": [], "datasets": []},
+            "metadata": {
+                "confidence": "insufficient",
+                "data_points": 0,
+                "message": "Keine Schlafdaten",
+            },
+        }
+
+    labels = [row["date"].isoformat() for row in rows]
+    duration_hours = [
+        safe_float(row["duration_minutes"]) / 60 if row["duration_minutes"] else None for row in rows
+    ]
+
+    quality_scores = [(d / 8 * 100) if d else None for d in duration_hours]
+
+    datasets = [
+        {
+            "label": "Schlafdauer (h)",
+            "data": duration_hours,
+            "borderColor": "#3B82F6",
+            "backgroundColor": "rgba(59, 130, 246, 0.1)",
+            "borderWidth": 2,
+            "tension": 0.3,
+            "yAxisID": "y1",
+            "fill": True,
+        },
+        {
+            "label": "Qualität (%)",
+            "data": quality_scores,
+            "borderColor": "#1D9E75",
+            "backgroundColor": "rgba(29, 158, 117, 0.1)",
+            "borderWidth": 2,
+            "tension": 0.3,
+            "yAxisID": "y2",
+            "fill": False,
+        },
+    ]
+
+    return {
+        "chart_type": "line",
+        "data": {"labels": labels, "datasets": datasets},
+        "metadata": serialize_dates(
+            {
+                "confidence": duration_data["confidence"],
+                "data_points": len(rows),
+                "avg_duration_hours": round(duration_data["avg_duration_hours"], 1),
+                "sleep_quality_score": quality_data.get("quality_score", 0),
+            }
+        ),
+    }
+
+
+def build_sleep_debt_chart_payload(profile_id: str, days: int) -> Dict[str, Any]:
+    if days < 7:
+        days = 7
+    if days > 90:
+        days = 90
+    current_debt = calculate_sleep_debt_hours(profile_id)
+
+    if current_debt is None:
+        return {
+            "chart_type": "line",
+            "data": {"labels": [], "datasets": []},
+            "metadata": {
+                "confidence": "insufficient",
+                "data_points": 0,
+                "message": "Keine Schlafdaten für Schulden-Berechnung",
+            },
+        }
+
+    cutoff = (datetime.now() - timedelta(days=days)).strftime("%Y-%m-%d")
+
+    with get_db() as conn:
+        cur = get_cursor(conn)
+        cur.execute(
+            """SELECT date, duration_minutes
+               FROM sleep_log
+               WHERE profile_id=%s AND date >= %s
+               ORDER BY date""",
+            (profile_id, cutoff),
+        )
+        rows = cur.fetchall()
+
+    if not rows:
+        return {
+            "chart_type": "line",
+            "data": {"labels": [], "datasets": []},
+            "metadata": {
+                "confidence": "insufficient",
+                "data_points": 0,
+                "message": "Keine Schlafdaten",
+            },
+        }
+
+    labels = [row["date"].isoformat() for row in rows]
+
+    target_hours = 8.0
+    cumulative_debt = 0.0
+    debt_values = []
+
+    for row in rows:
+        actual_hours = safe_float(row["duration_minutes"]) / 60 if row["duration_minutes"] else 0
+        daily_deficit = target_hours - actual_hours
+        cumulative_debt += daily_deficit
+        debt_values.append(cumulative_debt)
+
+    return {
+        "chart_type": "line",
+        "data": {
+            "labels": labels,
+            "datasets": [
+                {
+                    "label": "Schlafschuld (Stunden)",
+                    "data": debt_values,
+                    "borderColor": "#EF4444",
+                    "backgroundColor": "rgba(239, 68, 68, 0.1)",
+                    "borderWidth": 2,
+                    "tension": 0.3,
+                    "fill": True,
+                }
+            ],
+        },
+        "metadata": serialize_dates(
+            {
+                "confidence": calculate_confidence(len(rows), days, "general"),
+                "data_points": len(rows),
+                "current_debt_hours": round(float(current_debt), 1),
+                "final_debt_hours": round(float(cumulative_debt), 1),
+            }
+        ),
+    }
+
+
+def build_vital_signs_matrix_chart_payload(profile_id: str, days: int) -> Dict[str, Any]:
+    if days < 7:
+        days = 7
+    if days > 30:
+        days = 30
+    cutoff = (datetime.now() - timedelta(days=days)).strftime("%Y-%m-%d")
+
+    with get_db() as conn:
+        cur = get_cursor(conn)
+        cur.execute(
+            """SELECT resting_hr, hrv, vo2_max, spo2, respiratory_rate
+               FROM vitals_baseline
+               WHERE profile_id=%s AND date >= %s
+               ORDER BY date DESC
+               LIMIT 1""",
+            (profile_id, cutoff),
+        )
+        vitals_row = cur.fetchone()
+
+        cur.execute(
+            """SELECT systolic, diastolic
+               FROM blood_pressure_log
+               WHERE profile_id=%s AND measured_at::date >= %s::date
+               ORDER BY measured_at DESC
+               LIMIT 1""",
+            (profile_id, cutoff),
+        )
+        bp_row = cur.fetchone()
+
+    if not vitals_row and not bp_row:
+        return {
+            "chart_type": "bar",
+            "data": {"labels": [], "datasets": []},
+            "metadata": {
+                "confidence": "insufficient",
+                "data_points": 0,
+                "message": "Keine aktuellen Vitalwerte",
+            },
+        }
+
+    labels = []
+    values = []
+
+    if vitals_row:
+        if vitals_row["resting_hr"]:
+            labels.append("Ruhepuls (bpm)")
+            values.append(safe_float(vitals_row["resting_hr"]))
+        if vitals_row["hrv"]:
+            labels.append("HRV (ms)")
+            values.append(safe_float(vitals_row["hrv"]))
+        if vitals_row["vo2_max"]:
+            labels.append("VO2 Max")
+            values.append(safe_float(vitals_row["vo2_max"]))
+        if vitals_row["spo2"]:
+            labels.append("SpO2 (%)")
+            values.append(safe_float(vitals_row["spo2"]))
+        if vitals_row["respiratory_rate"]:
+            labels.append("Atemfrequenz")
+            values.append(safe_float(vitals_row["respiratory_rate"]))
+
+    if bp_row:
+        if bp_row["systolic"]:
+            labels.append("Blutdruck sys (mmHg)")
+            values.append(safe_float(bp_row["systolic"]))
+        if bp_row["diastolic"]:
+            labels.append("Blutdruck dia (mmHg)")
+            values.append(safe_float(bp_row["diastolic"]))
+
+    if not labels:
+        return {
+            "chart_type": "bar",
+            "data": {"labels": [], "datasets": []},
+            "metadata": {
+                "confidence": "insufficient",
+                "data_points": 0,
+                "message": "Keine Vitalwerte verfügbar",
+            },
+        }
+
+    return {
+        "chart_type": "bar",
+        "data": {
+            "labels": labels,
+            "datasets": [
+                {
+                    "label": "Wert",
+                    "data": values,
+                    "backgroundColor": "#1D9E75",
+                    "borderColor": "#085041",
+                    "borderWidth": 1,
+                }
+            ],
+        },
+        "metadata": {
+            "confidence": "medium",
+            "data_points": len(values),
+            "note": "Latest measurements within last " + str(days) + " days",
+        },
+    }
diff --git a/backend/data_layer/recovery_interpretation.py b/backend/data_layer/recovery_interpretation.py
new file mode 100644
index 0000000..8be9863
--- /dev/null
+++ b/backend/data_layer/recovery_interpretation.py
@@ -0,0 +1,183 @@
+"""
+KPIs und Kurz-Aussagen für Recovery-Dashboard (Layer 2b).
+"""
+
+from __future__ import annotations
+
+from typing import Any, Dict, List, Optional
+
+
+def _verdict(status: str) -> str:
+    if status == "good":
+        return "Gut"
+    if status == "warn":
+        return "Hinweis"
+    return "Achtung"
+
+
+def _recovery_score_status(score: Optional[int]) -> str:
+    if score is None:
+        return "warn"
+    if score >= 70:
+        return "good"
+    if score >= 45:
+        return "warn"
+    return "bad"
+
+
+def _debt_status(hours: Optional[float]) -> str:
+    if hours is None:
+        return "warn"
+    if hours <= 2:
+        return "good"
+    if hours <= 8:
+        return "warn"
+    return "bad"
+
+
+def build_recovery_dashboard_kpi_tiles(
+    recovery_score: Optional[int],
+    sleep_debt_hours: Optional[float],
+    avg_sleep_hours: Optional[float],
+    hrv_vs_baseline_pct: Optional[float],
+    rhr_vs_baseline_pct: Optional[float],
+) -> List[Dict[str, Any]]:
+    tiles: List[Dict[str, Any]] = []
+
+    rs = _recovery_score_status(recovery_score)
+    tiles.append(
+        {
+            "key": "recovery_score",
+            "category": "Recovery-Score",
+            "icon": "💚",
+            "value": str(recovery_score) if recovery_score is not None else "—",
+            "sublabel": "Modell aus Schlaf + Vitaldaten",
+            "status": rs,
+            "verdict": _verdict(rs),
+            "hoverTop": "Gesamt-Recovery-Score (0–100)",
+            "hoverBody": "calculate_recovery_score_v2 — gleiche Quelle wie Platzhalter.",
+            "keys": ["recovery_score"],
+        }
+    )
+
+    ds = _debt_status(sleep_debt_hours)
+    tiles.append(
+        {
+            "key": "sleep_debt",
+            "category": "Schlafschuld",
+            "icon": "⏳",
+            "value": f"{sleep_debt_hours:.1f} h".replace(".", ",")
+            if sleep_debt_hours is not None
+            else "—",
+            "sublabel": "Kumuliert (Ziel 8 h/Nacht)",
+            "status": ds,
+            "verdict": _verdict(ds),
+            "hoverTop": "Geschätzte Schlafschuld",
+            "hoverBody": "calculate_sleep_debt_hours",
+            "keys": ["sleep_debt_hours"],
+        }
+    )
+
+    tiles.append(
+        {
+            "key": "avg_sleep",
+            "category": "Ø Schlafdauer",
+            "icon": "🌙",
+            "value": f"{avg_sleep_hours:.1f} h".replace(".", ",") if avg_sleep_hours is not None else "—",
+            "sublabel": "Im gewählten Fenster",
+            "status": "good" if avg_sleep_hours and avg_sleep_hours >= 7 else "warn",
+            "verdict": "Gut" if avg_sleep_hours and avg_sleep_hours >= 7 else "Hinweis",
+            "hoverTop": "Durchschnittliche Schlafdauer",
+            "hoverBody": "get_sleep_duration_data",
+            "keys": ["sleep_duration_avg"],
+        }
+    )
+
+    h_s = (
+        "good"
+        if hrv_vs_baseline_pct is not None and hrv_vs_baseline_pct >= 0
+        else "warn"
+        if hrv_vs_baseline_pct is not None
+        else "warn"
+    )
+    tiles.append(
+        {
+            "key": "hrv_baseline",
+            "category": "HRV vs. Basis",
+            "icon": "〰️",
+            "value": f"{hrv_vs_baseline_pct:+.1f} %".replace(".", ",")
+            if hrv_vs_baseline_pct is not None
+            else "—",
+            "sublabel": "Letzte 3 Tage vs. ältere Basis",
+            "status": h_s,
+            "verdict": _verdict(h_s),
+            "hoverTop": "Abweichung HRV vom Referenzmittel",
+            "hoverBody": "calculate_hrv_vs_baseline_pct",
+            "keys": ["hrv_vs_baseline"],
+        }
+    )
+
+    tiles.append(
+        {
+            "key": "rhr_baseline",
+            "category": "Ruhepuls vs. Basis",
+            "icon": "❤️",
+            "value": f"{rhr_vs_baseline_pct:+.1f} %".replace(".", ",")
+            if rhr_vs_baseline_pct is not None
+            else "—",
+            "sublabel": "Niedriger oft günstiger",
+            "status": "good",
+            "verdict": "Gut",
+            "hoverTop": "Abweichung Ruhepuls",
+            "hoverBody": "calculate_rhr_vs_baseline_pct",
+            "keys": ["rhr_vs_baseline"],
+        }
+    )
+
+    return tiles
+
+
+def build_recovery_progress_insights(
+    recovery_score: Optional[int],
+    sleep_debt_hours: Optional[float],
+    hrv_vs_baseline_pct: Optional[float],
+) -> List[Dict[str, Any]]:
+    out: List[Dict[str, Any]] = []
+
+    if recovery_score is not None:
+        tone = "good" if recovery_score >= 65 else "warn" if recovery_score >= 45 else "bad"
+        out.append(
+            {
+                "key": "ins_rec",
+                "tone": tone,
+                "title": "Gesamterholung",
+                "body": f"Der Recovery-Score liegt bei {recovery_score}/100. "
+                "Er kombiniert Schlaf- und Vital-Signale — ideal für die Einordnung von Trainingstagen.",
+            }
+        )
+
+    if sleep_debt_hours is not None:
+        tone = "good" if sleep_debt_hours <= 3 else "warn" if sleep_debt_hours <= 10 else "bad"
+        out.append(
+            {
+                "key": "ins_debt",
+                "tone": tone,
+                "title": "Schlaf nachholen",
+                "body": f"Geschätzte Schlafschuld: {sleep_debt_hours:.1f} h. "
+                "Hohe Schulden erhöhen Verletzungs- und Ermüdungsrisiko — Priorität Schlafhygiene.",
+            }
+        )
+
+    if hrv_vs_baseline_pct is not None:
+        tone = "good" if hrv_vs_baseline_pct >= 0 else "warn"
+        out.append(
+            {
+                "key": "ins_hrv",
+                "tone": tone,
+                "title": "Autonomes System",
+                "body": f"HRV liegt {hrv_vs_baseline_pct:+.1f} % relativ zur Basis. "
+                "Positive Werte werden oft mit guter Regeneration assoziiert (individuell interpretieren).",
+            }
+        )
+
+    return out
diff --git a/backend/data_layer/recovery_viz.py b/backend/data_layer/recovery_viz.py
new file mode 100644
index 0000000..2decd00
--- /dev/null
+++ b/backend/data_layer/recovery_viz.py
@@ -0,0 +1,111 @@
+"""
+Layer 2b: Recovery/Erholung — Bundle für Verlauf unter Fitness (Issue 53).
+"""
+
+from __future__ import annotations
+
+from typing import Any, Dict, Optional
+
+from db import get_db, get_cursor
+from data_layer.recovery_chart_payloads import (
+    build_hrv_rhr_baseline_chart_payload,
+    build_recovery_score_chart_payload,
+    build_sleep_debt_chart_payload,
+    build_sleep_duration_quality_chart_payload,
+    build_vital_signs_matrix_chart_payload,
+)
+from data_layer.recovery_interpretation import (
+    build_recovery_dashboard_kpi_tiles,
+    build_recovery_progress_insights,
+)
+from data_layer.recovery_metrics import (
+    calculate_hrv_vs_baseline_pct,
+    calculate_recovery_score_v2,
+    calculate_rhr_vs_baseline_pct,
+    calculate_sleep_debt_hours,
+    get_sleep_duration_data,
+)
+
+
+def _has_recovery_sources(profile_id: str) -> bool:
+    with get_db() as conn:
+        cur = get_cursor(conn)
+        cur.execute("SELECT 1 FROM sleep_log WHERE profile_id=%s LIMIT 1", (profile_id,))
+        if cur.fetchone():
+            return True
+        cur.execute("SELECT 1 FROM vitals_baseline WHERE profile_id=%s LIMIT 1", (profile_id,))
+        return cur.fetchone() is not None
+
+
+def get_recovery_dashboard_viz_bundle(profile_id: str, days: int) -> Dict[str, Any]:
+    """
+    Ein Request: KPIs, Insights, Charts R1–R5 (Chart.js-kompatibel).
+    """
+    if not _has_recovery_sources(profile_id):
+        return {
+            "confidence": "insufficient",
+            "has_recovery_data": False,
+            "message": "Noch keine Schlaf- oder Vitaldaten",
+            "kpi_tiles": [],
+            "progress_insights": [],
+            "charts": {},
+            "meta": {"layer_1": "recovery_metrics", "layer_2b": "recovery_viz"},
+        }
+
+    all_history = days >= 9999
+    eff_days = 3650 if all_history else max(7, min(int(days), 3650))
+    chart_days = min(90, max(7, min(eff_days, 365)))
+    vital_days = min(30, max(7, chart_days))
+
+    recovery_score_val = calculate_recovery_score_v2(profile_id)
+    sleep_debt = calculate_sleep_debt_hours(profile_id)
+    dur = get_sleep_duration_data(profile_id, chart_days)
+    avg_sleep = None
+    if dur.get("confidence") != "insufficient":
+        avg_sleep = float(dur.get("avg_duration_hours") or 0) or None
+
+    hrv_dev = calculate_hrv_vs_baseline_pct(profile_id)
+    rhr_dev = calculate_rhr_vs_baseline_pct(profile_id)
+
+    kpi_tiles = build_recovery_dashboard_kpi_tiles(
+        recovery_score_val,
+        float(sleep_debt) if sleep_debt is not None else None,
+        avg_sleep,
+        float(hrv_dev) if hrv_dev is not None else None,
+        float(rhr_dev) if rhr_dev is not None else None,
+    )
+
+    insights = build_recovery_progress_insights(
+        recovery_score_val,
+        float(sleep_debt) if sleep_debt is not None else None,
+        float(hrv_dev) if hrv_dev is not None else None,
+    )
+
+    charts = {
+        "recovery_score": build_recovery_score_chart_payload(profile_id, chart_days),
+        "hrv_rhr": build_hrv_rhr_baseline_chart_payload(profile_id, chart_days),
+        "sleep_duration_quality": build_sleep_duration_quality_chart_payload(profile_id, chart_days),
+        "sleep_debt": build_sleep_debt_chart_payload(profile_id, chart_days),
+        "vital_signs_matrix": build_vital_signs_matrix_chart_payload(profile_id, vital_days),
+    }
+
+    conf = "medium"
+    if recovery_score_val is None and sleep_debt is None:
+        conf = "low"
+
+    return {
+        "confidence": conf,
+        "has_recovery_data": True,
+        "days_requested": days,
+        "effective_window_days": eff_days,
+        "chart_days_used": chart_days,
+        "vital_matrix_days_used": vital_days,
+        "kpi_tiles": kpi_tiles,
+        "progress_insights": insights,
+        "charts": charts,
+        "meta": {
+            "layer_1": "recovery_metrics",
+            "layer_2b": "recovery_viz",
+            "issue": "53-layer-2b-recovery",
+        },
+    }
diff --git a/backend/routers/charts.py b/backend/routers/charts.py
index fca7c36..508cff0 100644
--- a/backend/routers/charts.py
+++ b/backend/routers/charts.py
@@ -33,6 +33,15 @@ from data_layer.body_metrics import (
 )
 from data_layer.body_viz import get_body_history_viz_bundle
 from data_layer.nutrition_viz import get_nutrition_history_viz_bundle
+from data_layer.fitness_viz import get_fitness_dashboard_viz_bundle
+from data_layer.recovery_viz import get_recovery_dashboard_viz_bundle
+from data_layer.recovery_chart_payloads import (
+    build_recovery_score_chart_payload,
+    build_hrv_rhr_baseline_chart_payload,
+    build_sleep_duration_quality_chart_payload,
+    build_sleep_debt_chart_payload,
+    build_vital_signs_matrix_chart_payload,
+)
 from data_layer.nutrition_metrics import (
     get_nutrition_average_data,
     get_protein_targets_data,
@@ -44,13 +53,14 @@ from data_layer.nutrition_metrics import (
 )
 from data_layer.activity_metrics import (
     get_activity_summary_data,
-    get_training_type_distribution_data,
     calculate_training_minutes_week,
-    calculate_quality_sessions_pct,
-    calculate_proxy_internal_load_7d,
     calculate_monotony_score,
     calculate_strain_score,
-    calculate_ability_balance
+    calculate_ability_balance,
+    build_training_volume_chart_payload,
+    build_training_type_distribution_chart_payload,
+    build_quality_sessions_chart_payload,
+    build_load_monitoring_chart_payload,
 )
 from data_layer.recovery_metrics import (
     get_sleep_duration_data,
@@ -288,6 +298,44 @@ def get_nutrition_history_viz(
     return serialize_dates(bundle)
 
 
+@router.get("/fitness-dashboard-viz")
+def get_fitness_dashboard_viz(
+    days: int = Query(
+        default=28,
+        ge=7,
+        le=9999,
+        description="Analysefenster in Tagen (9999 = lange Historie)",
+    ),
+    session: dict = Depends(require_auth),
+) -> Dict:
+    """
+    Layer 2b: Fitness-Übersicht — KPI-Kacheln + Volumen- und Typ-Verteilungs-Charts.
+
+    Daten aus activity_metrics (gleiche Payloads wie training-volume / training-type-distribution).
+    """
+    profile_id = session["profile_id"]
+    bundle = get_fitness_dashboard_viz_bundle(profile_id, days)
+    return serialize_dates(bundle)
+
+
+@router.get("/recovery-dashboard-viz")
+def get_recovery_dashboard_viz(
+    days: int = Query(
+        default=28,
+        ge=7,
+        le=9999,
+        description="Analysefenster in Tagen (9999 = lange Historie)",
+    ),
+    session: dict = Depends(require_auth),
+) -> Dict:
+    """
+    Layer 2b: Recovery/Erholung — KPIs, Insights, Charts R1–R5 (recovery_metrics).
+    """
+    profile_id = session["profile_id"]
+    bundle = get_recovery_dashboard_viz_bundle(profile_id, days)
+    return serialize_dates(bundle)
+
+
 @router.get("/circumferences")
 def get_circumferences_chart(
     max_age_days: int = Query(default=90, ge=7, le=365),
@@ -1051,66 +1099,7 @@ def get_training_volume_chart(
         Chart.js bar chart with weekly training minutes
     """
     profile_id = session['profile_id']
-
-    from db import get_db, get_cursor
-    with get_db() as conn:
-        cur = get_cursor(conn)
-        cutoff = (datetime.now() - timedelta(weeks=weeks)).strftime('%Y-%m-%d')
-
-        # Get weekly aggregates
-        cur.execute(
-            """SELECT
-                DATE_TRUNC('week', date) as week_start,
-                SUM(duration_min) as total_minutes,
-                COUNT(*) as session_count
-               FROM activity_log
-               WHERE profile_id=%s AND date >= %s
-               GROUP BY week_start
-               ORDER BY week_start""",
-            (profile_id, cutoff)
-        )
-        rows = cur.fetchall()
-
-    if not rows:
-        return {
-            "chart_type": "bar",
-            "data": {
-                "labels": [],
-                "datasets": []
-            },
-            "metadata": {
-                "confidence": "insufficient",
-                "data_points": 0,
-                "message": "Keine Aktivitätsdaten vorhanden"
-            }
-        }
-
-    labels = [row['week_start'].strftime('KW %V') for row in rows]
-    values = [safe_float(row['total_minutes']) for row in rows]
-
-    confidence = calculate_confidence(len(rows), weeks * 7, "general")
-
-    return {
-        "chart_type": "bar",
-        "data": {
-            "labels": labels,
-            "datasets": [
-                {
-                    "label": "Trainingsminuten",
-                    "data": values,
-                    "backgroundColor": "#1D9E75",
-                    "borderColor": "#085041",
-                    "borderWidth": 1
-                }
-            ]
-        },
-        "metadata": serialize_dates({
-            "confidence": confidence,
-            "data_points": len(rows),
-            "avg_minutes_week": round(sum(values) / len(values), 1) if values else 0,
-            "total_sessions": sum(row['session_count'] for row in rows)
-        })
-    }
+    return build_training_volume_chart_payload(profile_id, weeks)
 
 
 @router.get("/training-type-distribution")
@@ -1131,52 +1120,7 @@ def get_training_type_distribution_chart(
         Chart.js pie chart with training categories
     """
     profile_id = session['profile_id']
-
-    dist_data = get_training_type_distribution_data(profile_id, days)
-
-    if dist_data['confidence'] == 'insufficient':
-        return {
-            "chart_type": "pie",
-            "data": {
-                "labels": [],
-                "datasets": []
-            },
-            "metadata": {
-                "confidence": "insufficient",
-                "data_points": 0,
-                "message": "Keine Trainingstypen-Daten"
-            }
-        }
-
-    labels = [item['category'] for item in dist_data['distribution']]
-    values = [item['count'] for item in dist_data['distribution']]
-
-    # Color palette for training categories
-    colors = [
-        "#1D9E75", "#3B82F6", "#F59E0B", "#EF4444",
-        "#8B5CF6", "#10B981", "#F97316", "#06B6D4"
-    ]
-
-    return {
-        "chart_type": "pie",
-        "data": {
-            "labels": labels,
-            "datasets": [
-                {
-                    "data": values,
-                    "backgroundColor": colors[:len(values)],
-                    "borderWidth": 2,
-                    "borderColor": "#fff"
-                }
-            ]
-        },
-        "metadata": {
-            "confidence": dist_data['confidence'],
-            "total_sessions": dist_data['total_sessions'],
-            "categorized_sessions": dist_data['categorized_sessions'],
-            "uncategorized_sessions": dist_data['uncategorized_sessions']
-        }
-    }
+    return build_training_type_distribution_chart_payload(profile_id, days)
 
 
 @router.get("/quality-sessions")
@@ -1197,63 +1141,7 @@ def get_quality_sessions_chart(
         Chart.js bar chart with quality metrics
     """
     profile_id = session['profile_id']
-
-    # Calculate quality session percentage
-    quality_pct = calculate_quality_sessions_pct(profile_id, days)
-
-    from db import get_db, get_cursor
-    with get_db() as conn:
-        cur = get_cursor(conn)
-        cutoff = (datetime.now() - timedelta(days=days)).strftime('%Y-%m-%d')
-
-        cur.execute(
-            """SELECT COUNT(*) as total
-               FROM activity_log
-               WHERE profile_id=%s AND date >= %s""",
-            (profile_id, cutoff)
-        )
-        row = cur.fetchone()
-        total_sessions = row['total'] if row else 0
-
-    if total_sessions == 0:
-        return {
-            "chart_type": "bar",
-            "data": {
-                "labels": [],
-                "datasets": []
-            },
-            "metadata": {
-                "confidence": "insufficient",
-                "data_points": 0,
-                "message": "Keine Aktivitätsdaten"
-            }
-        }
-
-    quality_count = int(quality_pct / 100 * total_sessions)
-    regular_count = total_sessions - quality_count
-
-    return {
-        "chart_type": "bar",
-        "data": {
-            "labels": ["Qualitäts-Sessions", "Reguläre Sessions"],
-            "datasets": [
-                {
-                    "label": "Anzahl",
-                    "data": [quality_count, regular_count],
-                    "backgroundColor": ["#1D9E75", "#888"],
-                    "borderColor": "#085041",
-                    "borderWidth": 1
-                }
-            ]
-        },
-        "metadata": {
-            "confidence": calculate_confidence(total_sessions, days, "general"),
-            "data_points": total_sessions,
-            "quality_pct": round(quality_pct, 1),
-            "quality_count": quality_count,
-            "regular_count": regular_count
-        }
-    }
+    return build_quality_sessions_chart_payload(profile_id, days)
 
 
 @router.get("/load-monitoring")
@@ -1274,74 +1162,7 @@ def get_load_monitoring_chart(
         Chart.js line chart with load metrics
     """
     profile_id = session['profile_id']
-
-    # Calculate loads
-    acute_load = calculate_proxy_internal_load_7d(profile_id)
-    chronic_load = calculate_proxy_internal_load_7d(profile_id, days=28)
-
-    # ACWR (Acute:Chronic Workload Ratio)
-    acwr = acute_load / chronic_load if chronic_load > 0 else 0
-
-    # Fetch daily loads for timeline
-    from db import get_db, get_cursor
-    with get_db() as conn:
-        cur = get_cursor(conn)
-        cutoff = (datetime.now() - timedelta(days=days)).strftime('%Y-%m-%d')
-
-        cur.execute(
-            """SELECT
-                date,
-                SUM(duration_min * COALESCE(rpe, 5)) as daily_load
-               FROM activity_log
-               WHERE profile_id=%s AND date >= %s
-               GROUP BY date
-               ORDER BY date""",
-            (profile_id, cutoff)
-        )
-        rows = cur.fetchall()
-
-    if not rows:
-        return {
-            "chart_type": "line",
-            "data": {
-                "labels": [],
-                "datasets": []
-            },
-            "metadata": {
-                "confidence": "insufficient",
-                "data_points": 0,
-                "message": "Keine Load-Daten"
-            }
-        }
-
-    labels = [row['date'].isoformat() for row in rows]
-    values = [safe_float(row['daily_load']) for row in rows]
-
-    return {
-        "chart_type": "line",
-        "data": {
-            "labels": labels,
-            "datasets": [
-                {
-                    "label": "Tages-Load",
-                    "data": values,
-                    "borderColor": "#1D9E75",
-                    "backgroundColor": "rgba(29, 158, 117, 0.1)",
-                    "borderWidth": 2,
-                    "tension": 0.3,
-                    "fill": True
-                }
-            ]
-        },
-        "metadata": serialize_dates({
-            "confidence": calculate_confidence(len(rows), days, "general"),
-            "data_points": len(rows),
-            "acute_load_7d": round(acute_load, 1),
-            "chronic_load_28d": round(chronic_load, 1),
-            "acwr": round(acwr, 2),
-            "acwr_status": "optimal" if 0.8 <= acwr <= 1.3 else "suboptimal"
-        })
-    }
+    return build_load_monitoring_chart_payload(profile_id, days)
 
 
 @router.get("/monotony-strain")
@@ -1573,106 +1394,9 @@ def get_recovery_score_chart(
     days: int = Query(default=28, ge=7, le=90),
     session: dict = Depends(require_auth)
 ) -> Dict:
-    """
-    Recovery score timeline (R1).
-
-    Shows daily recovery scores over time.
-
-    Args:
-        days: Analysis window (7-90 days, default 28)
-        session: Auth session (injected)
-
-    Returns:
-        Chart.js line chart with recovery scores
-    """
-    profile_id = session['profile_id']
-
-    # For PoC: Use current recovery score and create synthetic timeline
-    # TODO: Store historical recovery scores for true timeline
-    current_score = calculate_recovery_score_v2(profile_id)
-
-    if current_score is None:
-        return {
-            "chart_type": "line",
-            "data": {
-                "labels": [],
-                "datasets": []
-            },
-            "metadata": {
-                "confidence": "insufficient",
-                "data_points": 0,
-                "message": "Keine Recovery-Daten vorhanden"
-            }
-        }
-
-    # Fetch vitals for timeline approximation
-    from db import get_db, get_cursor
-    with get_db() as conn:
-        cur = get_cursor(conn)
-        cutoff = (datetime.now() - timedelta(days=days)).strftime('%Y-%m-%d')
-
-        cur.execute(
-            """SELECT date, resting_hr, hrv_ms
-               FROM vitals_baseline
-               WHERE profile_id=%s AND date >= %s
-               ORDER BY date""",
-            (profile_id, cutoff)
-        )
-        rows = cur.fetchall()
-
-    if not rows:
-        return {
-            "chart_type": "line",
-            "data": {
-                "labels": [datetime.now().strftime('%Y-%m-%d')],
-                "datasets": [
-                    {
-                        "label": "Recovery Score",
-                        "data": [current_score],
-                        "borderColor": "#1D9E75",
-                        "backgroundColor": "rgba(29, 158, 117, 0.1)",
-                        "borderWidth": 2,
-                        "tension": 0.3,
-                        "fill": True
-                    }
-                ]
-            },
-            "metadata": {
-                "confidence": "low",
-                "data_points": 1,
-                "current_score": current_score
-            }
-        }
-
-    # Simple proxy: Use HRV as recovery indicator (higher HRV = better recovery)
-    # This is a placeholder until we store actual recovery scores
-    labels = [row['date'].isoformat() for row in rows]
-    # Normalize HRV to 0-100 scale (assume typical range 20-100ms)
-    values = [min(100, max(0, safe_float(row['hrv_ms']) if row['hrv_ms'] else 50)) for row in rows]
-
-    return {
-        "chart_type": "line",
-        "data": {
-            "labels": labels,
-            "datasets": [
-                {
-                    "label": "Recovery Score (proxy)",
-                    "data": values,
-                    "borderColor": "#1D9E75",
-                    "backgroundColor": "rgba(29, 158, 117, 0.1)",
-                    "borderWidth": 2,
-                    "tension": 0.3,
-                    "fill": True
-                }
-            ]
-        },
-        "metadata": serialize_dates({
-            "confidence": calculate_confidence(len(rows), days, "general"),
-            "data_points": len(rows),
-            "current_score": current_score,
-            "note": "Score based on HRV proxy; true recovery score calculation in development"
-        })
-    }
+    """Recovery score timeline (R1). Delegiert an recovery_chart_payloads."""
+    profile_id = session["profile_id"]
+    return build_recovery_score_chart_payload(profile_id, days)
 
 
 @router.get("/hrv-rhr-baseline")
@@ -1680,101 +1404,9 @@ def get_hrv_rhr_baseline_chart(
     days: int = Query(default=28, ge=7, le=90),
     session: dict = Depends(require_auth)
 ) -> Dict:
-    """
-    HRV/RHR vs baseline (R2).
-
-    Shows HRV and RHR trends vs. baseline values.
-
-    Args:
-        days: Analysis window (7-90 days, default 28)
-        session: Auth session (injected)
-
-    Returns:
-        Chart.js multi-line chart with HRV and RHR
-    """
-    profile_id = session['profile_id']
-
-    from db import get_db, get_cursor
-    with get_db() as conn:
-        cur = get_cursor(conn)
-        cutoff = (datetime.now() - timedelta(days=days)).strftime('%Y-%m-%d')
-
-        cur.execute(
-            """SELECT date, resting_hr, hrv_ms
-               FROM vitals_baseline
-               WHERE profile_id=%s AND date >= %s
-               ORDER BY date""",
-            (profile_id, cutoff)
-        )
-        rows = cur.fetchall()
-
-    if not rows:
-        return {
-            "chart_type": "line",
-            "data": {
-                "labels": [],
-                "datasets": []
-            },
-            "metadata": {
-                "confidence": "insufficient",
-                "data_points": 0,
-                "message": "Keine Vitalwerte vorhanden"
-            }
-        }
-
-    labels = [row['date'].isoformat() for row in rows]
-    hrv_values = [safe_float(row['hrv_ms']) if row['hrv_ms'] else None for row in rows]
-    rhr_values = [safe_float(row['resting_hr']) if row['resting_hr'] else None for row in rows]
-
-    # Calculate baselines (28d median)
-    hrv_baseline = calculate_hrv_vs_baseline_pct(profile_id)  # This returns % deviation
-    rhr_baseline = calculate_rhr_vs_baseline_pct(profile_id)  # This returns % deviation
-
-    # For chart, we need actual baseline values (approximation)
-    hrv_filtered = [v for v in hrv_values if v is not None]
-    rhr_filtered = [v for v in rhr_values if v is not None]
-
-    avg_hrv = sum(hrv_filtered) / len(hrv_filtered) if hrv_filtered else 50
-    avg_rhr = sum(rhr_filtered) / len(rhr_filtered) if rhr_filtered else 60
-
-    datasets = [
-        {
-            "label": "HRV (ms)",
-            "data": hrv_values,
-            "borderColor": "#1D9E75",
-            "backgroundColor": "rgba(29, 158, 117, 0.1)",
-            "borderWidth": 2,
-            "tension": 0.3,
-            "yAxisID": "y1",
-            "fill": False
-        },
-        {
-            "label": "RHR (bpm)",
-            "data": rhr_values,
-            "borderColor": "#3B82F6",
-            "backgroundColor": "rgba(59, 130, 246, 0.1)",
-            "borderWidth": 2,
-            "tension": 0.3,
-            "yAxisID": "y2",
-            "fill": False
-        }
-    ]
-
-    return {
-        "chart_type": "line",
-        "data": {
-            "labels": labels,
-            "datasets": datasets
-        },
-        "metadata": serialize_dates({
-            "confidence": calculate_confidence(len(rows), days, "general"),
-            "data_points": len(rows),
-            "avg_hrv": round(avg_hrv, 1),
-            "avg_rhr": round(avg_rhr, 1),
-            "hrv_vs_baseline_pct": hrv_baseline,
-            "rhr_vs_baseline_pct": rhr_baseline
-        })
-    }
+    """HRV/RHR vs baseline (R2)."""
+    profile_id = session["profile_id"]
+    return build_hrv_rhr_baseline_chart_payload(profile_id, days)
 
 
 @router.get("/sleep-duration-quality")
@@ -1782,107 +1414,9 @@ def get_sleep_duration_quality_chart(
     days: int = Query(default=28, ge=7, le=90),
     session: dict = Depends(require_auth)
 ) -> Dict:
-    """
-    Sleep duration + quality (R3).
-
-    Shows sleep duration and quality score over time.
-
-    Args:
-        days: Analysis window (7-90 days, default 28)
-        session: Auth session (injected)
-
-    Returns:
-        Chart.js multi-line chart with sleep metrics
-    """
-    profile_id = session['profile_id']
-
-    duration_data = get_sleep_duration_data(profile_id, days)
-    quality_data = get_sleep_quality_data(profile_id, days)
-
-    if duration_data['confidence'] == 'insufficient':
-        return {
-            "chart_type": "line",
-            "data": {
-                "labels": [],
-                "datasets": []
-            },
-            "metadata": {
-                "confidence": "insufficient",
-                "data_points": 0,
-                "message": "Keine Schlafdaten vorhanden"
-            }
-        }
-
-    from db import get_db, get_cursor
-    with get_db() as conn:
-        cur = get_cursor(conn)
-        cutoff = (datetime.now() - timedelta(days=days)).strftime('%Y-%m-%d')
-
-        cur.execute(
-            """SELECT date, total_sleep_min
-               FROM sleep_log
-               WHERE profile_id=%s AND date >= %s
-               ORDER BY date""",
-            (profile_id, cutoff)
-        )
-        rows = cur.fetchall()
-
-    if not rows:
-        return {
-            "chart_type": "line",
-            "data": {
-                "labels": [],
-                "datasets": []
-            },
-            "metadata": {
-                "confidence": "insufficient",
-                "data_points": 0,
-                "message": "Keine Schlafdaten"
-            }
-        }
-
-    labels = [row['date'].isoformat() for row in rows]
-    duration_hours = [safe_float(row['total_sleep_min']) / 60 if row['total_sleep_min'] else None for row in rows]
-
-    # Quality score (simple proxy: % of 8 hours)
-    quality_scores = [(d / 8 * 100) if d else None for d in duration_hours]
-
-    datasets = [
-        {
-            "label": "Schlafdauer (h)",
-            "data": duration_hours,
-            "borderColor": "#3B82F6",
-            "backgroundColor": "rgba(59, 130, 246, 0.1)",
-            "borderWidth": 2,
-            "tension": 0.3,
-            "yAxisID": "y1",
-            "fill": True
-        },
-        {
-            "label": "Qualität (%)",
-            "data": quality_scores,
-            "borderColor": "#1D9E75",
-            "backgroundColor": "rgba(29, 158, 117, 0.1)",
-            "borderWidth": 2,
-            "tension": 0.3,
-            "yAxisID": "y2",
-            "fill": False
-        }
-    ]
-
-    return {
-        "chart_type": "line",
-        "data": {
-            "labels": labels,
-            "datasets": datasets
-        },
-        "metadata": serialize_dates({
-            "confidence": duration_data['confidence'],
-            "data_points": len(rows),
-            "avg_duration_hours": round(duration_data['avg_duration_hours'], 1),
-            "sleep_quality_score": quality_data.get('sleep_quality_score', 0)
-        })
-    }
+    """Sleep duration + quality (R3)."""
+    profile_id = session["profile_id"]
+    return build_sleep_duration_quality_chart_payload(profile_id, days)
 
 
 @router.get("/sleep-debt")
@@ -1890,100 +1424,9 @@ def get_sleep_debt_chart(
     days: int = Query(default=28, ge=7, le=90),
     session: dict = Depends(require_auth)
 ) -> Dict:
-    """
-    Sleep debt accumulation (R4).
-
-    Shows cumulative sleep debt over time.
-
-    Args:
-        days: Analysis window (7-90 days, default 28)
-        session: Auth session (injected)
-
-    Returns:
-        Chart.js line chart with sleep debt
-    """
-    profile_id = session['profile_id']
-
-    current_debt = calculate_sleep_debt_hours(profile_id)
-
-    if current_debt is None:
-        return {
-            "chart_type": "line",
-            "data": {
-                "labels": [],
-                "datasets": []
-            },
-            "metadata": {
-                "confidence": "insufficient",
-                "data_points": 0,
-                "message": "Keine Schlafdaten für Schulden-Berechnung"
-            }
-        }
-
-    from db import get_db, get_cursor
-    with get_db() as conn:
-        cur = get_cursor(conn)
-        cutoff = (datetime.now() - timedelta(days=days)).strftime('%Y-%m-%d')
-
-        cur.execute(
-            """SELECT date, total_sleep_min
-               FROM sleep_log
-               WHERE profile_id=%s AND date >= %s
-               ORDER BY date""",
-            (profile_id, cutoff)
-        )
-        rows = cur.fetchall()
-
-    if not rows:
-        return {
-            "chart_type": "line",
-            "data": {
-                "labels": [],
-                "datasets": []
-            },
-            "metadata": {
-                "confidence": "insufficient",
-                "data_points": 0,
-                "message": "Keine Schlafdaten"
-            }
-        }
-
-    labels = [row['date'].isoformat() for row in rows]
-
-    # Calculate cumulative debt (target 8h/night)
-    target_hours = 8.0
-    cumulative_debt = 0
-    debt_values = []
-
-    for row in rows:
-        actual_hours = safe_float(row['total_sleep_min']) / 60 if row['total_sleep_min'] else 0
-        daily_deficit = target_hours - actual_hours
-        cumulative_debt += daily_deficit
-        debt_values.append(cumulative_debt)
-
-    return {
-        "chart_type": "line",
-        "data": {
-            "labels": labels,
-            "datasets": [
-                {
-                    "label": "Schlafschuld (Stunden)",
-                    "data": debt_values,
-                    "borderColor": "#EF4444",
-                    "backgroundColor": "rgba(239, 68, 68, 0.1)",
-                    "borderWidth": 2,
-                    "tension": 0.3,
-                    "fill": True
-                }
-            ]
-        },
-        "metadata": serialize_dates({
-            "confidence": calculate_confidence(len(rows), days, "general"),
-            "data_points": len(rows),
-            "current_debt_hours": round(current_debt, 1),
-            "final_debt_hours": round(cumulative_debt, 1)
-        })
-    }
+    """Sleep debt (R4)."""
+    profile_id = session["profile_id"]
+    return build_sleep_debt_chart_payload(profile_id, days)
 
 
 @router.get("/vital-signs-matrix")
@@ -1991,123 +1434,9 @@ def get_vital_signs_matrix_chart(
     days: int = Query(default=7, ge=7, le=30),
     session: dict = Depends(require_auth)
 ) -> Dict:
-    """
-    Vital signs matrix (R5).
-
-    Shows latest vital signs as horizontal bar chart.
-
-    Args:
-        days: Max age of measurements (7-30 days, default 7)
-        session: Auth session (injected)
-
-    Returns:
-        Chart.js horizontal bar chart with vital signs
-    """
-    profile_id = session['profile_id']
-
-    from db import get_db, get_cursor
-    with get_db() as conn:
-        cur = get_cursor(conn)
-        cutoff = (datetime.now() - timedelta(days=days)).strftime('%Y-%m-%d')
-
-        # Get latest vitals
-        cur.execute(
-            """SELECT resting_hr, hrv_ms, vo2_max, spo2, respiratory_rate
-               FROM vitals_baseline
-               WHERE profile_id=%s AND date >= %s
-               ORDER BY date DESC
-               LIMIT 1""",
-            (profile_id, cutoff)
-        )
-        vitals_row = cur.fetchone()
-
-        # Get latest blood pressure
-        cur.execute(
-            """SELECT systolic, diastolic
-               FROM blood_pressure_log
-               WHERE profile_id=%s AND date >= %s
-               ORDER BY date DESC, time DESC
-               LIMIT 1""",
-            (profile_id, cutoff)
-        )
-        bp_row = cur.fetchone()
-
-    if not vitals_row and not bp_row:
-        return {
-            "chart_type": "bar",
-            "data": {
-                "labels": [],
-                "datasets": []
-            },
-            "metadata": {
-                "confidence": "insufficient",
-                "data_points": 0,
-                "message": "Keine aktuellen Vitalwerte"
-            }
-        }
-
-    labels = []
-    values = []
-
-    if vitals_row:
-        if vitals_row['resting_hr']:
-            labels.append("Ruhepuls (bpm)")
-            values.append(safe_float(vitals_row['resting_hr']))
-        if vitals_row['hrv_ms']:
-            labels.append("HRV (ms)")
-            values.append(safe_float(vitals_row['hrv_ms']))
-        if vitals_row['vo2_max']:
-            labels.append("VO2 Max")
-            values.append(safe_float(vitals_row['vo2_max']))
-        if vitals_row['spo2']:
-            labels.append("SpO2 (%)")
-            values.append(safe_float(vitals_row['spo2']))
-        if vitals_row['respiratory_rate']:
-            labels.append("Atemfrequenz")
-            values.append(safe_float(vitals_row['respiratory_rate']))
-
-    if bp_row:
-        if bp_row['systolic']:
-            labels.append("Blutdruck sys (mmHg)")
-            values.append(safe_float(bp_row['systolic']))
-        if bp_row['diastolic']:
-            labels.append("Blutdruck dia (mmHg)")
-            values.append(safe_float(bp_row['diastolic']))
-
-    if not labels:
-        return {
-            "chart_type": "bar",
-            "data": {
-                "labels": [],
-                "datasets": []
-            },
-            "metadata": {
-                "confidence": "insufficient",
-                "data_points": 0,
-                "message": "Keine Vitalwerte verfügbar"
-            }
-        }
-
-    return {
-        "chart_type": "bar",
-        "data": {
-            "labels": labels,
-            "datasets": [
-                {
-                    "label": "Wert",
-                    "data": values,
-                    "backgroundColor": "#1D9E75",
-                    "borderColor": "#085041",
-                    "borderWidth": 1
-                }
-            ]
-        },
-        "metadata": {
-            "confidence": "medium",
-            "data_points": len(values),
-            "note": "Latest measurements within last " + str(days) + " days"
-        }
-    }
+    """Vital signs matrix (R5)."""
+    profile_id = session["profile_id"]
+    return build_vital_signs_matrix_chart_payload(profile_id, days)
 
 
 # ── Correlation Charts ──────────────────────────────────────────────────────
diff --git a/docs/README.md b/docs/README.md
index d3c7aea..b33386b 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -27,6 +27,7 @@ Dieser Ordner ist **immer mit Git versioniert**. Er ergänzt **`.claude/docs/`**
 | `issue-51-prompt-page-assignment.md` |
 | `issue-52-blood-pressure-dual-targets.md` |
 | `issue-53-phase-0c-multi-layer-architecture.md` |
+| `issue-fitness-dashboard-layer2b.md` |
 | `issue-54-dynamic-placeholder-system.md` |
 | `issue-55-dynamic-aggregation-methods.md` |
 | `issue-76-training-quality-goal-list-filter.md` |
@@ -56,4 +57,4 @@ Themen-Übersicht (lokal): **`.claude/docs/GITEA_ISSUES_INDEX.md`**
 
 ---
 
-**Stand:** 2026-04-08
+**Stand:** 2026-04-19
diff --git a/docs/issues/issue-fitness-dashboard-layer2b.md b/docs/issues/issue-fitness-dashboard-layer2b.md
new file mode 100644
index 0000000..70fdc05
--- /dev/null
+++ b/docs/issues/issue-fitness-dashboard-layer2b.md
@@ -0,0 +1,54 @@
+# Fitness-Dashboard (Layer 2b) – Abnahme & technische Zuordnung
+
+**Status:** umgesetzt (Frontend + Backend)  
+**Bezug:** Issue #53 (Phase 0c) – Layer 1 → Layer 2b Bundle → UI nur Darstellung  
+**Stand:** 2026-04-19
+
+---
+
+## Ziel
+
+- Eine **Fitness-Übersicht** auf **`/history`** (Tab Fitness), analog Körper/Ernährung — **keine parallelen Berechnungen** im Client für Layer 2b.
+- **Single Source of Truth:** `data_layer/activity_metrics` (und Scores/Focus wie bei den Platzhaltern), identische Chart-Payloads wie die bestehenden Chart-Endpunkte A1/A2.
+
+---
+
+## Backend
+
+| Bestandteil | Pfad / Endpoint |
+|-------------|-----------------|
+| Chart-Payloads (A1/A2) | `build_training_volume_chart_payload`, `build_training_type_distribution_chart_payload` in `backend/data_layer/activity_metrics.py` |
+| KPI-Kacheln (Struktur für UI) | `backend/data_layer/fitness_interpretation.py` → `build_fitness_dashboard_kpi_tiles` |
+| Bundle | `backend/data_layer/fitness_viz.py` → `get_fitness_dashboard_viz_bundle(profile_id, days)` |
+| API | `GET /api/charts/fitness-dashboard-viz?days=7…9999` in `backend/routers/charts.py` |
+
+**Hinweise:**
+
+- `days >= 9999` wählt eine **lange Historie** für die Zusammenfassung (analog Ernährungs-Bundle).
+- `calculate_quality_sessions_pct(profile_id, days)` unterstützt ein variables Fenster (wird auch vom Quality-Chart genutzt).
+
+---
+
+## Frontend
+
+| Bestandteil | Pfad |
+|-------------|------|
+| API-Client | `getFitnessDashboardViz(days)` in `frontend/src/utils/api.js` |
+| Darstellung | `frontend/src/components/FitnessDashboardOverview.jsx` |
+| Einbindung | `frontend/src/pages/History.jsx` → `ActivitySection` (gemeinsamer `PeriodSelector` wie die Liste darunter) |
+| Erfassung | `/activity` bleibt reine Erfassung; Capture-Hub-Label **Aktivität** |
+
+---
+
+## Erweiterungen (optional)
+
+- Weitere Charts aus A5–A8 ins Bundle (Monotonie, Fähigkeiten …), gleiches Muster: Builder in `activity_metrics`, Router nur delegieren.
+
+---
+
+## Abnahme-Checkliste
+
+- [x] Bundle liefert u. a. `has_activity_entries`, `summary`, `kpi_tiles`, `progress_insights`, `volume_delta`, `charts.training_volume`, `charts.training_type_distribution`, `charts.quality_sessions`, `charts.load_monitoring`, `load_chart_days_used`, `meta`.
+- [x] Verlauf `/history` → Fitness: **keine** zweiten Charts/KPIs aus `activities`-Liste (keine Redundanz zur Erfassungs-API).
+- [x] Chart-Endpunkte A3/A4 nutzen dieselben Builder wie das Bundle (`build_quality_sessions_chart_payload`, `build_load_monitoring_chart_payload`).
+- [x] `calculate_proxy_internal_load_window` ersetzt fehlerhaften `days=28`-Aufruf an der alten 7-Tage-Funktion (chronische Last).
diff --git a/frontend/src/components/FitnessDashboardOverview.jsx b/frontend/src/components/FitnessDashboardOverview.jsx
new file mode 100644
index 0000000..447a4b2
--- /dev/null
+++ b/frontend/src/components/FitnessDashboardOverview.jsx
@@ -0,0 +1,348 @@
+import { useState, useEffect } from 'react'
+import { useNavigate } from 'react-router-dom'
+import {
+  BarChart,
+  Bar,
+  XAxis,
+  YAxis,
+  Tooltip,
+  ResponsiveContainer,
+  CartesianGrid,
+  PieChart,
+  Pie,
+  LineChart,
+  Line,
+  Cell,
+} from 'recharts'
+import { api } from '../utils/api'
+import KpiTilesOverview from './KpiTilesOverview'
+import { getStatusColor } from '../utils/interpret'
+import dayjs from 'dayjs'
+
+const PERIODS = [
+  { v: 7, label: '7 Tage' },
+  { v: 28, label: '28 Tage' },
+  { v: 90, label: '90 Tage' },
+  { v: 9999, label: 'Gesamt' },
+]
+
+/**
+ * Layer 2b: Kennzahlen und Charts nur aus GET /api/charts/fitness-dashboard-viz (activity_metrics).
+ */
+export default function FitnessDashboardOverview({
+  period: periodProp,
+  onPeriodChange,
+  hidePeriodSelector = false,
+}) {
+  const nav = useNavigate()
+  const [internalPeriod, setInternalPeriod] = useState(28)
+  const controlled = periodProp !== undefined && typeof onPeriodChange === 'function'
+  const period = controlled ? periodProp : internalPeriod
+  const setPeriod = controlled ? onPeriodChange : setInternalPeriod
+  const [viz, setViz] = useState(null)
+  const [loading, setLoading] = useState(true)
+  const [err, setErr] = useState(null)
+
+  useEffect(() => {
+    let cancelled = false
+    setLoading(true)
+    setErr(null)
+    api
+      .getFitnessDashboardViz(period)
+      .then((v) => {
+        if (!cancelled) setViz(v)
+      })
+      .catch((e) => {
+        if (!cancelled) setErr(e.message || 'Laden fehlgeschlagen')
+      })
+      .finally(() => {
+        if (!cancelled) setLoading(false)
+      })
+    return () => {
+      cancelled = true
+    }
+  }, [period])
+
+  if (loading) {
+    return (
+      <div className="card section-gap">
+        <div className="card-title">Fitness-Übersicht</div>
+        <div className="spinner" style={{ margin: 24 }} />
+      </div>
+    )
+  }
+
+  if (err) {
+    return (
+      <div className="card section-gap">
+        <div className="card-title">Fitness-Übersicht</div>
+        <div style={{ color: 'var(--danger)' }}>{err}</div>
+      </div>
+    )
+  }
+
+  if (!viz?.has_activity_entries) {
+    return (
+      <div className="card section-gap">
+        <div className="card-title">Fitness-Übersicht</div>
+        <p style={{ fontSize: 12, color: 'var(--text3)', lineHeight: 1.45, marginBottom: 14 }}>
+          Noch keine Aktivitätsdaten. Sobald du Trainings erfasst oder importierst, erscheinen Auswertungen hier.
+        </p>
+        <button type="button" className="btn btn-primary" onClick={() => nav('/activity')}>
+          Zur Erfassung
+        </button>
+      </div>
+    )
+  }
+
+  const vol = viz.charts?.training_volume
+  const typ = viz.charts?.training_type_distribution
+  const qual = viz.charts?.quality_sessions
+  const loadCh = viz.charts?.load_monitoring
+
+  const volRows = (vol?.data?.labels || []).map((name, i) => ({
+    name,
+    min: vol?.data?.datasets?.[0]?.data?.[i] ?? 0,
+  }))
+  const pieLabels = typ?.data?.labels || []
+  const pieVals = typ?.data?.datasets?.[0]?.data || []
+  const pieColors = typ?.data?.datasets?.[0]?.backgroundColor || []
+  const pieData = pieLabels.map((name, i) => ({
+    name,
+    value: pieVals[i],
+    fill: pieColors[i] || '#888780',
+  }))
+
+  const qualLabels = qual?.data?.labels || []
+  const qualVals = qual?.data?.datasets?.[0]?.data || []
+  const qualBg = qual?.data?.datasets?.[0]?.backgroundColor || []
+  const qualBar = qualLabels.map((name, i) => ({
+    name,
+    n: qualVals[i] ?? 0,
+    fill: qualBg[i] || '#1D9E75',
+  }))
+
+  const loadLabels = loadCh?.data?.labels || []
+  const loadVals = loadCh?.data?.datasets?.[0]?.data || []
+  const loadRows = loadLabels.map((iso, i) => ({
+    t: dayjs(iso).format('DD.MM.'),
+    load: loadVals[i] ?? 0,
+  }))
+  const loadMeta = loadCh?.metadata || {}
+
+  const kpiTiles = (viz.kpi_tiles || []).map((t) => ({
+    ...t,
+    sublabel:
+      typeof t.sublabel === 'string' && t.sublabel.length > 42 ? `${t.sublabel.slice(0, 40)}…` : t.sublabel,
+  }))
+
+  const insights = viz.progress_insights || []
+  const eff = viz.effective_window_days
+  const wUsed = viz.training_volume_weeks_used
+  const dTyp = viz.training_type_dist_days_used
+  const loadDays = viz.load_chart_days_used
+
+  const showPeriodDropdown = !hidePeriodSelector && !controlled
+
+  return (
+    <div className="card section-gap">
+      <div className="card-title" style={{ display: 'flex', flexWrap: 'wrap', alignItems: 'center', gap: 12 }}>
+        <span>Fitness-Übersicht</span>
+        {showPeriodDropdown ? (
+          <label
+            style={{ fontSize: 12, fontWeight: 500, color: 'var(--text3)', display: 'flex', alignItems: 'center', gap: 8 }}
+          >
+            Zeitraum
+            <select
+              className="form-input"
+              style={{ maxWidth: 140, padding: '6px 10px', fontSize: 13 }}
+              value={period}
+              onChange={(e) => setPeriod(Number(e.target.value))}
+            >
+              {PERIODS.map((p) => (
+                <option key={p.v} value={p.v}>
+                  {p.label}
+                </option>
+              ))}
+            </select>
+          </label>
+        ) : null}
+      </div>
+
+      <p style={{ fontSize: 11, color: 'var(--text3)', lineHeight: 1.45, marginBottom: 10 }}>
+        Alles aus dem Aktivitäts-Data-Layer (Issue 53). Zusammenfassung ca. <strong>{eff}</strong> Tage · Volumen{' '}
+        <strong>{wUsed}</strong> Wochen · Kategorien <strong>{dTyp}</strong> Tage · Load-Zeitreihe{' '}
+        <strong>{loadDays ?? '—'}</strong> Tage
+        {viz.last_updated ? (
+          <>
+            {' '}
+            · letzte Aktivität <strong>{viz.last_updated}</strong>
+          </>
+        ) : null}
+        .
+      </p>
+
+      <KpiTilesOverview tiles={kpiTiles} heading="Kennzahlen" />
+
+      {insights.length > 0 ? (
+        <div style={{ marginBottom: 14 }}>
+          <div style={{ fontSize: 12, fontWeight: 600, color: 'var(--text3)', marginBottom: 8 }}>Einschätzungen</div>
+          <div style={{ display: 'flex', flexDirection: 'column', gap: 8 }}>
+            {insights.map((ins) => (
+              <div
+                key={ins.key}
+                style={{
+                  borderRadius: 8,
+                  padding: '10px 12px',
+                  border: '1px solid var(--border)',
+                  borderLeft: `4px solid ${getStatusColor(['good', 'warn', 'bad'].includes(ins.tone) ? ins.tone : 'warn')}`,
+                  background: 'var(--surface2)',
+                }}
+              >
+                <div style={{ fontSize: 12, fontWeight: 600, marginBottom: 4 }}>{ins.title}</div>
+                <div style={{ fontSize: 12, color: 'var(--text2)', lineHeight: 1.45 }}>{ins.body}</div>
+              </div>
+            ))}
+          </div>
+        </div>
+      ) : null}
+
+      <div
+        style={{
+          display: 'grid',
+          gridTemplateColumns: 'repeat(auto-fit, minmax(260px, 1fr))',
+          gap: 16,
+          marginTop: 8,
+        }}
+      >
+        <div>
+          <div style={{ fontSize: 12, fontWeight: 600, color: 'var(--text3)', marginBottom: 6 }}>
+            Trainingsvolumen (Minuten / Woche)
+          </div>
+          {volRows.length >= 1 ? (
+            <ResponsiveContainer width="100%" height={200}>
+              <BarChart data={volRows} margin={{ top: 4, right: 8, bottom: 0, left: -12 }}>
+                <CartesianGrid stroke="var(--border)" strokeDasharray="3 3" />
+                <XAxis
+                  dataKey="name"
+                  tick={{ fontSize: 9, fill: 'var(--text3)' }}
+                  tickLine={false}
+                  interval={0}
+                  angle={-35}
+                  textAnchor="end"
+                  height={48}
+                />
+                <YAxis tick={{ fontSize: 9, fill: 'var(--text3)' }} tickLine={false} />
+                <Tooltip
+                  contentStyle={{
+                    background: 'var(--surface)',
+                    border: '1px solid var(--border)',
+                    borderRadius: 8,
+                    fontSize: 11,
+                  }}
+                  formatter={(v) => [`${Math.round(v)} min`, 'Volumen']}
+                />
+                <Bar dataKey="min" fill="#1D9E75" radius={[3, 3, 0, 0]} name="Minuten" />
+              </BarChart>
+            </ResponsiveContainer>
+          ) : (
+            <div style={{ fontSize: 12, color: 'var(--text3)' }}>Keine Wochendaten im gewählten Fenster.</div>
+          )}
+        </div>
+
+        <div>
+          <div style={{ fontSize: 12, fontWeight: 600, color: 'var(--text3)', marginBottom: 6 }}>
+            Training nach Kategorie
+          </div>
+          {pieData.length >= 1 ? (
+            <ResponsiveContainer width="100%" height={200}>
+              <PieChart>
+                <Pie
+                  data={pieData}
+                  dataKey="value"
+                  nameKey="name"
+                  cx="50%"
+                  cy="50%"
+                  outerRadius={72}
+                  label={({ name, percent }) => `${name} ${(percent * 100).toFixed(0)}%`}
+                />
+                <Tooltip
+                  contentStyle={{
+                    background: 'var(--surface)',
+                    border: '1px solid var(--border)',
+                    borderRadius: 8,
+                    fontSize: 11,
+                  }}
+                />
+              </PieChart>
+            </ResponsiveContainer>
+          ) : (
+            <div style={{ fontSize: 12, color: 'var(--text3)' }}>Keine kategorisierten Sessions im Fenster.</div>
+          )}
+        </div>
+
+        <div>
+          <div style={{ fontSize: 12, fontWeight: 600, color: 'var(--text3)', marginBottom: 6 }}>
+            Qualitäts-Sessions (Schätzung)
+          </div>
+          {qualBar.length >= 1 ? (
+            <ResponsiveContainer width="100%" height={200}>
+              <BarChart data={qualBar} margin={{ top: 4, right: 8, bottom: 0, left: -12 }}>
+                <CartesianGrid stroke="var(--border)" strokeDasharray="3 3" />
+                <XAxis dataKey="name" tick={{ fontSize: 9, fill: 'var(--text3)' }} tickLine={false} />
+                <YAxis tick={{ fontSize: 9, fill: 'var(--text3)' }} tickLine={false} allowDecimals={false} />
+                <Tooltip
+                  contentStyle={{
+                    background: 'var(--surface)',
+                    border: '1px solid var(--border)',
+                    borderRadius: 8,
+                    fontSize: 11,
+                  }}
+                />
+                <Bar dataKey="n" radius={[3, 3, 0, 0]}>
+                  {qualBar.map((entry, i) => (
+                    <Cell key={`q-${i}`} fill={entry.fill} />
+                  ))}
+                </Bar>
+              </BarChart>
+            </ResponsiveContainer>
+          ) : (
+            <div style={{ fontSize: 12, color: 'var(--text3)' }}>Keine Daten.</div>
+          )}
+        </div>
+
+        <div style={{ gridColumn: '1 / -1', maxWidth: '100%' }}>
+          <div style={{ fontSize: 12, fontWeight: 600, color: 'var(--text3)', marginBottom: 6 }}>
+            Belastung (Proxy-Load · duration×RPE / Tag)
+          </div>
+          {loadRows.length >= 1 ? (
+            <>
+              <ResponsiveContainer width="100%" height={220}>
+                <LineChart data={loadRows} margin={{ top: 4, right: 8, bottom: 0, left: -12 }}>
+                  <CartesianGrid stroke="var(--border)" strokeDasharray="3 3" />
+                  <XAxis dataKey="t" tick={{ fontSize: 9, fill: 'var(--text3)' }} tickLine={false} />
+                  <YAxis tick={{ fontSize: 9, fill: 'var(--text3)' }} tickLine={false} />
+                  <Tooltip
+                    contentStyle={{
+                      background: 'var(--surface)',
+                      border: '1px solid var(--border)',
+                      borderRadius: 8,
+                      fontSize: 11,
+                    }}
+                  />
+                  <Line type="monotone" dataKey="load" stroke="#1D9E75" strokeWidth={2} dot={false} name="Load" />
+                </LineChart>
+              </ResponsiveContainer>
+              <div style={{ fontSize: 10, color: 'var(--text3)', marginTop: 6, lineHeight: 1.4 }}>
+                ACWR {loadMeta.acwr != null ? Number(loadMeta.acwr).toFixed(2) : '—'} (
+                {loadMeta.acwr_status === 'optimal' ? 'oft als günstig beschrieben' : 'außerhalb 0,8–1,3'} · Proxy)
+              </div>
+            </>
+          ) : (
+            <div style={{ fontSize: 12, color: 'var(--text3)' }}>Keine Load-Daten im Fenster.</div>
+          )}
+        </div>
+      </div>
+    </div>
+  )
+}
diff --git a/frontend/src/components/RecoveryCharts.jsx b/frontend/src/components/RecoveryCharts.jsx
index a07cdda..6cad7bd 100644
--- a/frontend/src/components/RecoveryCharts.jsx
+++ b/frontend/src/components/RecoveryCharts.jsx
@@ -1,320 +1,8 @@
-import { useState, useEffect } from 'react'
-import {
-  LineChart, Line, BarChart, Bar,
-  XAxis, YAxis, Tooltip, ResponsiveContainer, CartesianGrid
-} from 'recharts'
-import { api } from '../utils/api'
-import dayjs from 'dayjs'
-
-const fmtDate = d => dayjs(d).format('DD.MM')
-
-function ChartCard({ title, loading, error, children }) {
-  return (
-    <div className="card" style={{marginBottom:12}}>
-      <div style={{fontSize:12,fontWeight:600,color:'var(--text3)',marginBottom:8}}>
-        {title}
-      </div>
-      {loading && (
-        <div style={{display:'flex',justifyContent:'center',padding:40}}>
-          <div className="spinner" style={{width:32,height:32}}/>
-        </div>
-      )}
-      {error && (
-        <div style={{padding:20,textAlign:'center',color:'var(--text3)',fontSize:12}}>
-          {error}
-        </div>
-      )}
-      {!loading && !error && children}
-    </div>
-  )
-}
+import RecoveryDashboardOverview from './RecoveryDashboardOverview'
 
 /**
- * Recovery Charts Component (R1-R5)
- *
- * Displays 5 recovery chart endpoints:
- * - Recovery Score Timeline (R1)
- * - HRV/RHR vs Baseline (R2)
- * - Sleep Duration + Quality (R3)
- * - Sleep Debt (R4)
- * - Vital Signs Matrix (R5)
+ * @deprecated Nutze direkt {@link RecoveryDashboardOverview}. Wrapper für Dashboard-Widgets (days → period).
  */
 export default function RecoveryCharts({ days = 28 }) {
-  const [recoveryData, setRecoveryData] = useState(null)
-  const [hrvRhrData, setHrvRhrData] = useState(null)
-  const [sleepData, setSleepData] = useState(null)
-  const [debtData, setDebtData] = useState(null)
-  const [vitalsData, setVitalsData] = useState(null)
-
-  const [loading, setLoading] = useState({})
-  const [errors, setErrors] = useState({})
-
-  useEffect(() => {
-    loadCharts()
-  }, [days])
-
-  const loadCharts = async () => {
-    // Load all 5 charts in parallel
-    await Promise.all([
-      loadRecoveryScore(),
-      loadHrvRhr(),
-      loadSleepQuality(),
-      loadSleepDebt(),
-      loadVitalSigns()
-    ])
-  }
-
-  const loadRecoveryScore = async () => {
-    setLoading(l => ({...l, recovery: true}))
-    setErrors(e => ({...e, recovery: null}))
-    try {
-      const data = await api.getRecoveryScoreChart(days)
-      setRecoveryData(data)
-    } catch (err) {
-      setErrors(e => ({...e, recovery: err.message}))
-    } finally {
-      setLoading(l => ({...l, recovery: false}))
-    }
-  }
-
-  const loadHrvRhr = async () => {
-    setLoading(l => ({...l, hrvRhr: true}))
-    setErrors(e => ({...e, hrvRhr: null}))
-    try {
-      const data = await api.getHrvRhrBaselineChart(days)
-      setHrvRhrData(data)
-    } catch (err) {
-      setErrors(e => ({...e, hrvRhr: err.message}))
-    } finally {
-      setLoading(l => ({...l, hrvRhr: false}))
-    }
-  }
-
-  const loadSleepQuality = async () => {
-    setLoading(l => ({...l, sleep: true}))
-    setErrors(e => ({...e, sleep: null}))
-    try {
-      const data = await api.getSleepDurationQualityChart(days)
-      setSleepData(data)
-    } catch (err) {
-      setErrors(e => ({...e, sleep: err.message}))
-    } finally {
-      setLoading(l => ({...l, sleep: false}))
-    }
-  }
-
-  const loadSleepDebt = async () => {
-    setLoading(l => ({...l, debt: true}))
-    setErrors(e => ({...e, debt: null}))
-    try {
-      const data = await api.getSleepDebtChart(days)
-      setDebtData(data)
-    } catch (err) {
-      setErrors(e => ({...e, debt: err.message}))
-    } finally {
-      setLoading(l => ({...l, debt: false}))
-    }
-  }
-
-  const loadVitalSigns = async () => {
-    setLoading(l => ({...l, vitals: true}))
-    setErrors(e => ({...e, vitals: null}))
-    try {
-      const data = await api.getVitalSignsMatrixChart(7) // Last 7 days
-      setVitalsData(data)
-    } catch (err) {
-      setErrors(e => ({...e, vitals: err.message}))
-    } finally {
-      setLoading(l => ({...l, vitals: false}))
-    }
-  }
-
-  // R1: Recovery Score Timeline
-  const renderRecoveryScore = () => {
-    if (!recoveryData || recoveryData.metadata?.confidence === 'insufficient') {
-      return <div style={{padding:20,textAlign:'center',color:'var(--text3)',fontSize:12}}>
-        Keine Recovery-Daten vorhanden
-      </div>
-    }
-
-    const chartData = recoveryData.data.labels.map((label, i) => ({
-      date: fmtDate(label),
-      score: recoveryData.data.datasets[0]?.data[i]
-    }))
-
-    return (
-      <>
-        <ResponsiveContainer width="100%" height={200}>
-          <LineChart data={chartData} margin={{top:4,right:8,bottom:0,left:-20}}>
-            <CartesianGrid stroke="var(--border)" strokeDasharray="3 3"/>
-            <XAxis dataKey="date" tick={{fontSize:9,fill:'var(--text3)'}} tickLine={false}
-              interval={Math.max(0,Math.floor(chartData.length/6)-1)}/>
-            <YAxis tick={{fontSize:9,fill:'var(--text3)'}} tickLine={false} domain={[0,100]}/>
-            <Tooltip contentStyle={{background:'var(--surface)',border:'1px solid var(--border)',borderRadius:8,fontSize:11}}/>
-            <Line type="monotone" dataKey="score" stroke="#1D9E75" strokeWidth={2} name="Recovery Score" dot={{r:2}}/>
-          </LineChart>
-        </ResponsiveContainer>
-        <div style={{marginTop:8,fontSize:10,color:'var(--text3)',textAlign:'center'}}>
-          Aktuell: {recoveryData.metadata.current_score}/100 · {recoveryData.metadata.data_points} Einträge
-        </div>
-      </>
-    )
-  }
-
-  // R2: HRV/RHR vs Baseline
-  const renderHrvRhr = () => {
-    if (!hrvRhrData || hrvRhrData.metadata?.confidence === 'insufficient') {
-      return <div style={{padding:20,textAlign:'center',color:'var(--text3)',fontSize:12}}>
-        Keine Vitalwerte vorhanden
-      </div>
-    }
-
-    const chartData = hrvRhrData.data.labels.map((label, i) => ({
-      date: fmtDate(label),
-      hrv: hrvRhrData.data.datasets[0]?.data[i],
-      rhr: hrvRhrData.data.datasets[1]?.data[i]
-    }))
-
-    return (
-      <>
-        <ResponsiveContainer width="100%" height={200}>
-          <LineChart data={chartData} margin={{top:4,right:8,bottom:0,left:-20}}>
-            <CartesianGrid stroke="var(--border)" strokeDasharray="3 3"/>
-            <XAxis dataKey="date" tick={{fontSize:9,fill:'var(--text3)'}} tickLine={false}
-              interval={Math.max(0,Math.floor(chartData.length/6)-1)}/>
-            <YAxis yAxisId="left" tick={{fontSize:9,fill:'var(--text3)'}} tickLine={false}/>
-            <YAxis yAxisId="right" orientation="right" tick={{fontSize:9,fill:'var(--text3)'}} tickLine={false}/>
-            <Tooltip contentStyle={{background:'var(--surface)',border:'1px solid var(--border)',borderRadius:8,fontSize:11}}/>
-            <Line yAxisId="left" type="monotone" dataKey="hrv" stroke="#1D9E75" strokeWidth={2} name="HRV (ms)" dot={{r:2}}/>
-            <Line yAxisId="right" type="monotone" dataKey="rhr" stroke="#3B82F6" strokeWidth={2} name="RHR (bpm)" dot={{r:2}}/>
-          </LineChart>
-        </ResponsiveContainer>
-        <div style={{marginTop:8,fontSize:10,color:'var(--text3)',textAlign:'center'}}>
-          HRV Ø {hrvRhrData.metadata.avg_hrv}ms · RHR Ø {hrvRhrData.metadata.avg_rhr}bpm
-        </div>
-      </>
-    )
-  }
-
-  // R3: Sleep Duration + Quality
-  const renderSleepQuality = () => {
-    if (!sleepData || sleepData.metadata?.confidence === 'insufficient') {
-      return <div style={{padding:20,textAlign:'center',color:'var(--text3)',fontSize:12}}>
-        Keine Schlafdaten vorhanden
-      </div>
-    }
-
-    const chartData = sleepData.data.labels.map((label, i) => ({
-      date: fmtDate(label),
-      duration: sleepData.data.datasets[0]?.data[i],
-      quality: sleepData.data.datasets[1]?.data[i]
-    }))
-
-    return (
-      <>
-        <ResponsiveContainer width="100%" height={200}>
-          <LineChart data={chartData} margin={{top:4,right:8,bottom:0,left:-20}}>
-            <CartesianGrid stroke="var(--border)" strokeDasharray="3 3"/>
-            <XAxis dataKey="date" tick={{fontSize:9,fill:'var(--text3)'}} tickLine={false}
-              interval={Math.max(0,Math.floor(chartData.length/6)-1)}/>
-            <YAxis yAxisId="left" tick={{fontSize:9,fill:'var(--text3)'}} tickLine={false}/>
-            <YAxis yAxisId="right" orientation="right" tick={{fontSize:9,fill:'var(--text3)'}} tickLine={false} domain={[0,100]}/>
-            <Tooltip contentStyle={{background:'var(--surface)',border:'1px solid var(--border)',borderRadius:8,fontSize:11}}/>
-            <Line yAxisId="left" type="monotone" dataKey="duration" stroke="#3B82F6" strokeWidth={2} name="Dauer (h)" dot={{r:2}}/>
-            <Line yAxisId="right" type="monotone" dataKey="quality" stroke="#1D9E75" strokeWidth={2} name="Qualität (%)" dot={{r:2}}/>
-          </LineChart>
-        </ResponsiveContainer>
-        <div style={{marginTop:8,fontSize:10,color:'var(--text3)',textAlign:'center'}}>
-          Ø {sleepData.metadata.avg_duration_hours}h Schlaf
-        </div>
-      </>
-    )
-  }
-
-  // R4: Sleep Debt
-  const renderSleepDebt = () => {
-    if (!debtData || debtData.metadata?.confidence === 'insufficient') {
-      return <div style={{padding:20,textAlign:'center',color:'var(--text3)',fontSize:12}}>
-        Keine Schlafdaten für Schulden-Berechnung
-      </div>
-    }
-
-    const chartData = debtData.data.labels.map((label, i) => ({
-      date: fmtDate(label),
-      debt: debtData.data.datasets[0]?.data[i]
-    }))
-
-    return (
-      <>
-        <ResponsiveContainer width="100%" height={200}>
-          <LineChart data={chartData} margin={{top:4,right:8,bottom:0,left:-20}}>
-            <CartesianGrid stroke="var(--border)" strokeDasharray="3 3"/>
-            <XAxis dataKey="date" tick={{fontSize:9,fill:'var(--text3)'}} tickLine={false}
-              interval={Math.max(0,Math.floor(chartData.length/6)-1)}/>
-            <YAxis tick={{fontSize:9,fill:'var(--text3)'}} tickLine={false}/>
-            <Tooltip contentStyle={{background:'var(--surface)',border:'1px solid var(--border)',borderRadius:8,fontSize:11}}/>
-            <Line type="monotone" dataKey="debt" stroke="#EF4444" strokeWidth={2} name="Schlafschuld (h)" dot={{r:2}}/>
-          </LineChart>
-        </ResponsiveContainer>
-        <div style={{marginTop:8,fontSize:10,color:'var(--text3)',textAlign:'center'}}>
-          Aktuelle Schuld: {debtData.metadata.current_debt_hours.toFixed(1)}h
-        </div>
-      </>
-    )
-  }
-
-  // R5: Vital Signs Matrix (Bar)
-  const renderVitalSigns = () => {
-    if (!vitalsData || vitalsData.metadata?.confidence === 'insufficient') {
-      return <div style={{padding:20,textAlign:'center',color:'var(--text3)',fontSize:12}}>
-        Keine aktuellen Vitalwerte
-      </div>
-    }
-
-    const chartData = vitalsData.data.labels.map((label, i) => ({
-      name: label,
-      value: vitalsData.data.datasets[0]?.data[i]
-    }))
-
-    return (
-      <>
-        <ResponsiveContainer width="100%" height={250}>
-          <BarChart data={chartData} margin={{top:4,right:8,bottom:0,left:20}} layout="horizontal">
-            <CartesianGrid stroke="var(--border)" strokeDasharray="3 3"/>
-            <XAxis type="number" tick={{fontSize:9,fill:'var(--text3)'}} tickLine={false}/>
-            <YAxis type="category" dataKey="name" tick={{fontSize:9,fill:'var(--text3)'}} tickLine={false} width={120}/>
-            <Tooltip contentStyle={{background:'var(--surface)',border:'1px solid var(--border)',borderRadius:8,fontSize:11}}/>
-            <Bar dataKey="value" fill="#1D9E75" name="Wert"/>
-          </BarChart>
-        </ResponsiveContainer>
-        <div style={{marginTop:8,fontSize:10,color:'var(--text3)',textAlign:'center'}}>
-          Letzte {vitalsData.metadata.data_points} Messwerte (7 Tage)
-        </div>
-      </>
-    )
-  }
-
-  return (
-    <div>
-      <ChartCard title="📊 Recovery Score" loading={loading.recovery} error={errors.recovery}>
-        {renderRecoveryScore()}
-      </ChartCard>
-
-      <ChartCard title="📊 HRV & Ruhepuls" loading={loading.hrvRhr} error={errors.hrvRhr}>
-        {renderHrvRhr()}
-      </ChartCard>
-
-      <ChartCard title="📊 Schlaf: Dauer & Qualität" loading={loading.sleep} error={errors.sleep}>
-        {renderSleepQuality()}
-      </ChartCard>
-
-      <ChartCard title="📊 Schlafschuld" loading={loading.debt} error={errors.debt}>
-        {renderSleepDebt()}
-      </ChartCard>
-
-      <ChartCard title="📊 Vitalwerte Überblick" loading={loading.vitals} error={errors.vitals}>
-        {renderVitalSigns()}
-      </ChartCard>
-    </div>
-  )
+  return <RecoveryDashboardOverview period={days} hidePeriodSelector />
 }
diff --git a/frontend/src/components/RecoveryDashboardOverview.jsx b/frontend/src/components/RecoveryDashboardOverview.jsx
new file mode 100644
index 0000000..31f0802
--- /dev/null
+++ b/frontend/src/components/RecoveryDashboardOverview.jsx
@@ -0,0 +1,402 @@
+import { useState, useEffect } from 'react'
+import { useNavigate } from 'react-router-dom'
+import {
+  LineChart,
+  Line,
+  BarChart,
+  Bar,
+  XAxis,
+  YAxis,
+  Tooltip,
+  ResponsiveContainer,
+  CartesianGrid,
+} from 'recharts'
+import { api } from '../utils/api'
+import KpiTilesOverview from './KpiTilesOverview'
+import { getStatusColor } from '../utils/interpret'
+import dayjs from 'dayjs'
+
+const fmtDate = (d) => dayjs(d).format('DD.MM.')
+
+function ChartCard({ title, loading, error, children }) {
+  return (
+    <div className="card" style={{ marginBottom: 12 }}>
+      <div style={{ fontSize: 12, fontWeight: 600, color: 'var(--text3)', marginBottom: 8 }}>{title}</div>
+      {loading && (
+        <div style={{ display: 'flex', justifyContent: 'center', padding: 40 }}>
+          <div className="spinner" style={{ width: 32, height: 32 }} />
+        </div>
+      )}
+      {error && (
+        <div style={{ padding: 20, textAlign: 'center', color: 'var(--text3)', fontSize: 12 }}>{error}</div>
+      )}
+      {!loading && !error && children}
+    </div>
+  )
+}
+
+/**
+ * Layer 2b: Erholung — ein Request GET /api/charts/recovery-dashboard-viz (recovery_metrics).
+ */
+export default function RecoveryDashboardOverview({
+  period: periodProp,
+  onPeriodChange,
+  hidePeriodSelector = false,
+}) {
+  const nav = useNavigate()
+  const [internalPeriod, setInternalPeriod] = useState(28)
+  const controlled = periodProp !== undefined && typeof onPeriodChange === 'function'
+  const period = controlled ? periodProp : internalPeriod
+  const setPeriod = controlled ? onPeriodChange : setInternalPeriod
+
+  const [viz, setViz] = useState(null)
+  const [loading, setLoading] = useState(true)
+  const [err, setErr] = useState(null)
+
+  useEffect(() => {
+    let cancelled = false
+    setLoading(true)
+    setErr(null)
+    api
+      .getRecoveryDashboardViz(period)
+      .then((v) => {
+        if (!cancelled) setViz(v)
+      })
+      .catch((e) => {
+        if (!cancelled) setErr(e.message || 'Laden fehlgeschlagen')
+      })
+      .finally(() => {
+        if (!cancelled) setLoading(false)
+      })
+    return () => {
+      cancelled = true
+    }
+  }, [period])
+
+  if (loading) {
+    return (
+      <div className="card section-gap">
+        <div className="card-title">Erholung & Vitalwerte</div>
+        <div className="spinner" style={{ margin: 24 }} />
+      </div>
+    )
+  }
+
+  if (err) {
+    return (
+      <div className="card section-gap">
+        <div className="card-title">Erholung & Vitalwerte</div>
+        <div style={{ color: 'var(--danger)' }}>{err}</div>
+      </div>
+    )
+  }
+
+  if (!viz?.has_recovery_data) {
+    return (
+      <div className="card section-gap">
+        <div className="card-title">Erholung & Vitalwerte</div>
+        <p style={{ fontSize: 12, color: 'var(--text3)', lineHeight: 1.45, marginBottom: 14 }}>
+          {viz?.message || 'Noch keine Schlaf- oder Vitaldaten.'} Sobald du Schlaf oder morgendliche Vitalwerte erfasst
+          oder importierst, erscheinen Auswertungen hier.
+        </p>
+        <button type="button" className="btn btn-primary" onClick={() => nav('/vitals')}>
+          Zu Vitalwerten
+        </button>
+      </div>
+    )
+  }
+
+  const recoveryData = viz.charts?.recovery_score
+  const hrvRhrData = viz.charts?.hrv_rhr
+  const sleepData = viz.charts?.sleep_duration_quality
+  const debtData = viz.charts?.sleep_debt
+  const vitalsData = viz.charts?.vital_signs_matrix
+
+  const kpiTiles = (viz.kpi_tiles || []).map((t) => ({
+    ...t,
+    sublabel:
+      typeof t.sublabel === 'string' && t.sublabel.length > 42 ? `${t.sublabel.slice(0, 40)}…` : t.sublabel,
+  }))
+  const insights = viz.progress_insights || []
+  const eff = viz.effective_window_days
+  const cDays = viz.chart_days_used
+  const vDays = viz.vital_matrix_days_used
+
+  const showPeriodDropdown = !hidePeriodSelector && !controlled
+
+  const renderRecoveryScore = () => {
+    if (!recoveryData || recoveryData.metadata?.confidence === 'insufficient') {
+      return (
+        <div style={{ padding: 20, textAlign: 'center', color: 'var(--text3)', fontSize: 12 }}>
+          Keine Recovery-Daten im Fenster
+        </div>
+      )
+    }
+    const chartData = recoveryData.data.labels.map((label, i) => ({
+      date: fmtDate(label),
+      score: recoveryData.data.datasets[0]?.data[i],
+    }))
+    return (
+      <>
+        <ResponsiveContainer width="100%" height={200}>
+          <LineChart data={chartData} margin={{ top: 4, right: 8, bottom: 0, left: -20 }}>
+            <CartesianGrid stroke="var(--border)" strokeDasharray="3 3" />
+            <XAxis
+              dataKey="date"
+              tick={{ fontSize: 9, fill: 'var(--text3)' }}
+              tickLine={false}
+              interval={Math.max(0, Math.floor(chartData.length / 6) - 1)}
+            />
+            <YAxis tick={{ fontSize: 9, fill: 'var(--text3)' }} tickLine={false} domain={[0, 100]} />
+            <Tooltip
+              contentStyle={{
+                background: 'var(--surface)',
+                border: '1px solid var(--border)',
+                borderRadius: 8,
+                fontSize: 11,
+              }}
+            />
+            <Line type="monotone" dataKey="score" stroke="#1D9E75" strokeWidth={2} name="Recovery Score" dot={{ r: 2 }} />
+          </LineChart>
+        </ResponsiveContainer>
+        <div style={{ marginTop: 8, fontSize: 10, color: 'var(--text3)', textAlign: 'center' }}>
+          Aktuell: {recoveryData.metadata.current_score}/100 · {recoveryData.metadata.data_points} Einträge
+        </div>
+      </>
+    )
+  }
+
+  const renderHrvRhr = () => {
+    if (!hrvRhrData || hrvRhrData.metadata?.confidence === 'insufficient') {
+      return (
+        <div style={{ padding: 20, textAlign: 'center', color: 'var(--text3)', fontSize: 12 }}>
+          Keine Vitalwerte im Fenster
+        </div>
+      )
+    }
+    const chartData = hrvRhrData.data.labels.map((label, i) => ({
+      date: fmtDate(label),
+      hrv: hrvRhrData.data.datasets[0]?.data[i],
+      rhr: hrvRhrData.data.datasets[1]?.data[i],
+    }))
+    return (
+      <>
+        <ResponsiveContainer width="100%" height={200}>
+          <LineChart data={chartData} margin={{ top: 4, right: 8, bottom: 0, left: -20 }}>
+            <CartesianGrid stroke="var(--border)" strokeDasharray="3 3" />
+            <XAxis
+              dataKey="date"
+              tick={{ fontSize: 9, fill: 'var(--text3)' }}
+              tickLine={false}
+              interval={Math.max(0, Math.floor(chartData.length / 6) - 1)}
+            />
+            <YAxis yAxisId="left" tick={{ fontSize: 9, fill: 'var(--text3)' }} tickLine={false} />
+            <YAxis yAxisId="right" orientation="right" tick={{ fontSize: 9, fill: 'var(--text3)' }} tickLine={false} />
+            <Tooltip
+              contentStyle={{
+                background: 'var(--surface)',
+                border: '1px solid var(--border)',
+                borderRadius: 8,
+                fontSize: 11,
+              }}
+            />
+            <Line yAxisId="left" type="monotone" dataKey="hrv" stroke="#1D9E75" strokeWidth={2} name="HRV (ms)" dot={{ r: 2 }} />
+            <Line yAxisId="right" type="monotone" dataKey="rhr" stroke="#3B82F6" strokeWidth={2} name="RHR (bpm)" dot={{ r: 2 }} />
+          </LineChart>
+        </ResponsiveContainer>
+        <div style={{ marginTop: 8, fontSize: 10, color: 'var(--text3)', textAlign: 'center' }}>
+          HRV Ø {hrvRhrData.metadata.avg_hrv}ms · RHR Ø {hrvRhrData.metadata.avg_rhr}bpm
+        </div>
+      </>
+    )
+  }
+
+  const renderSleepQuality = () => {
+    if (!sleepData || sleepData.metadata?.confidence === 'insufficient') {
+      return (
+        <div style={{ padding: 20, textAlign: 'center', color: 'var(--text3)', fontSize: 12 }}>
+          Keine Schlafdaten im Fenster
+        </div>
+      )
+    }
+    const chartData = sleepData.data.labels.map((label, i) => ({
+      date: fmtDate(label),
+      duration: sleepData.data.datasets[0]?.data[i],
+      quality: sleepData.data.datasets[1]?.data[i],
+    }))
+    return (
+      <>
+        <ResponsiveContainer width="100%" height={200}>
+          <LineChart data={chartData} margin={{ top: 4, right: 8, bottom: 0, left: -20 }}>
+            <CartesianGrid stroke="var(--border)" strokeDasharray="3 3" />
+            <XAxis
+              dataKey="date"
+              tick={{ fontSize: 9, fill: 'var(--text3)' }}
+              tickLine={false}
+              interval={Math.max(0, Math.floor(chartData.length / 6) - 1)}
+            />
+            <YAxis yAxisId="left" tick={{ fontSize: 9, fill: 'var(--text3)' }} tickLine={false} />
+            <YAxis yAxisId="right" orientation="right" tick={{ fontSize: 9, fill: 'var(--text3)' }} tickLine={false} domain={[0, 100]} />
+            <Tooltip
+              contentStyle={{
+                background: 'var(--surface)',
+                border: '1px solid var(--border)',
+                borderRadius: 8,
+                fontSize: 11,
+              }}
+            />
+            <Line yAxisId="left" type="monotone" dataKey="duration" stroke="#3B82F6" strokeWidth={2} name="Dauer (h)" dot={{ r: 2 }} />
+            <Line yAxisId="right" type="monotone" dataKey="quality" stroke="#1D9E75" strokeWidth={2} name="Qualität (%)" dot={{ r: 2 }} />
+          </LineChart>
+        </ResponsiveContainer>
+        <div style={{ marginTop: 8, fontSize: 10, color: 'var(--text3)', textAlign: 'center' }}>
+          Ø {sleepData.metadata.avg_duration_hours}h Schlaf
+        </div>
+      </>
+    )
+  }
+
+  const renderSleepDebt = () => {
+    if (!debtData || debtData.metadata?.confidence === 'insufficient') {
+      return (
+        <div style={{ padding: 20, textAlign: 'center', color: 'var(--text3)', fontSize: 12 }}>
+          Keine Schlafdaten für Schulden-Berechnung
+        </div>
+      )
+    }
+    const chartData = debtData.data.labels.map((label, i) => ({
+      date: fmtDate(label),
+      debt: debtData.data.datasets[0]?.data[i],
+    }))
+    const curDebt = debtData.metadata?.current_debt_hours
+    return (
+      <>
+        <ResponsiveContainer width="100%" height={200}>
+          <LineChart data={chartData} margin={{ top: 4, right: 8, bottom: 0, left: -20 }}>
+            <CartesianGrid stroke="var(--border)" strokeDasharray="3 3" />
+            <XAxis
+              dataKey="date"
+              tick={{ fontSize: 9, fill: 'var(--text3)' }}
+              tickLine={false}
+              interval={Math.max(0, Math.floor(chartData.length / 6) - 1)}
+            />
+            <YAxis tick={{ fontSize: 9, fill: 'var(--text3)' }} tickLine={false} />
+            <Tooltip
+              contentStyle={{
+                background: 'var(--surface)',
+                border: '1px solid var(--border)',
+                borderRadius: 8,
+                fontSize: 11,
+              }}
+            />
+            <Line type="monotone" dataKey="debt" stroke="#EF4444" strokeWidth={2} name="Schlafschuld (h)" dot={{ r: 2 }} />
+          </LineChart>
+        </ResponsiveContainer>
+        <div style={{ marginTop: 8, fontSize: 10, color: 'var(--text3)', textAlign: 'center' }}>
+          Aktuelle Schuld: {curDebt != null ? Number(curDebt).toFixed(1) : '—'}h
+        </div>
+      </>
+    )
+  }
+
+  const renderVitalSigns = () => {
+    if (!vitalsData || vitalsData.metadata?.confidence === 'insufficient') {
+      return (
+        <div style={{ padding: 20, textAlign: 'center', color: 'var(--text3)', fontSize: 12 }}>
+          Keine aktuellen Vitalwerte
+        </div>
+      )
+    }
+    const chartData = vitalsData.data.labels.map((label, i) => ({
+      name: label,
+      value: vitalsData.data.datasets[0]?.data[i],
+    }))
+    return (
+      <>
+        <ResponsiveContainer width="100%" height={250}>
+          <BarChart data={chartData} margin={{ top: 4, right: 8, bottom: 0, left: 20 }} layout="horizontal">
+            <CartesianGrid stroke="var(--border)" strokeDasharray="3 3" />
+            <XAxis type="number" tick={{ fontSize: 9, fill: 'var(--text3)' }} tickLine={false} />
+            <YAxis type="category" dataKey="name" tick={{ fontSize: 9, fill: 'var(--text3)' }} tickLine={false} width={120} />
+            <Tooltip
+              contentStyle={{
+                background: 'var(--surface)',
+                border: '1px solid var(--border)',
+                borderRadius: 8,
+                fontSize: 11,
+              }}
+            />
+            <Bar dataKey="value" fill="#1D9E75" name="Wert" />
+          </BarChart>
+        </ResponsiveContainer>
+        <div style={{ marginTop: 8, fontSize: 10, color: 'var(--text3)', textAlign: 'center' }}>
+          Letzte {vitalsData.metadata.data_points} Messwerte ({vDays} Tage)
+        </div>
+      </>
+    )
+  }
+
+  return (
+    <div className="card section-gap">
+      <div className="card-title" style={{ display: 'flex', flexWrap: 'wrap', alignItems: 'center', gap: 12 }}>
+        <span>Erholung & Vitalwerte</span>
+        {showPeriodDropdown ? (
+          <label
+            style={{ fontSize: 12, fontWeight: 500, color: 'var(--text3)', display: 'flex', alignItems: 'center', gap: 8 }}
+          >
+            Zeitraum
+            <select
+              className="form-input"
+              style={{ maxWidth: 140, padding: '6px 10px', fontSize: 13 }}
+              value={period}
+              onChange={(e) => setPeriod(Number(e.target.value))}
+            >
+              <option value={7}>7 Tage</option>
+              <option value={28}>28 Tage</option>
+              <option value={90}>90 Tage</option>
+              <option value={9999}>Gesamt</option>
+            </select>
+          </label>
+        ) : null}
+      </div>
+
+      <p style={{ fontSize: 11, color: 'var(--text3)', lineHeight: 1.45, marginBottom: 10 }}>
+        Auswertung aus dem Recovery-Data-Layer (Issue 53). Fenster ca. <strong>{eff}</strong> Tage · Charts{' '}
+        <strong>{cDays}</strong> Tage · Vital-Matrix <strong>{vDays}</strong> Tage.
+      </p>
+
+      <KpiTilesOverview tiles={kpiTiles} heading="Kennzahlen" />
+
+      {insights.length > 0 ? (
+        <div style={{ marginBottom: 14 }}>
+          <div style={{ fontSize: 12, fontWeight: 600, color: 'var(--text3)', marginBottom: 8 }}>Einschätzungen</div>
+          <div style={{ display: 'flex', flexDirection: 'column', gap: 8 }}>
+            {insights.map((ins) => (
+              <div
+                key={ins.key}
+                style={{
+                  borderRadius: 8,
+                  padding: '10px 12px',
+                  border: '1px solid var(--border)',
+                  borderLeft: `4px solid ${getStatusColor(['good', 'warn', 'bad'].includes(ins.tone) ? ins.tone : 'warn')}`,
+                  background: 'var(--surface2)',
+                }}
+              >
+                <div style={{ fontSize: 12, fontWeight: 600, marginBottom: 4 }}>{ins.title}</div>
+                <div style={{ fontSize: 12, color: 'var(--text2)', lineHeight: 1.45 }}>{ins.body}</div>
+              </div>
+            ))}
+          </div>
+        </div>
+      ) : null}
+
+      <div style={{ fontSize: 12, fontWeight: 600, color: 'var(--text3)', marginBottom: 8, marginTop: 4 }}>Diagramme</div>
+
+      <ChartCard title="📊 Recovery Score">{renderRecoveryScore()}</ChartCard>
+      <ChartCard title="📊 HRV & Ruhepuls">{renderHrvRhr()}</ChartCard>
+      <ChartCard title="📊 Schlaf: Dauer & Qualität">{renderSleepQuality()}</ChartCard>
+      <ChartCard title="📊 Schlafschuld">{renderSleepDebt()}</ChartCard>
+      <ChartCard title="📊 Vitalwerte Überblick">{renderVitalSigns()}</ChartCard>
+    </div>
+  )
+}
diff --git a/frontend/src/components/dashboard-widgets/RecoveryChartsPanelWidget.jsx b/frontend/src/components/dashboard-widgets/RecoveryChartsPanelWidget.jsx
index 4047427..218cb81 100644
--- a/frontend/src/components/dashboard-widgets/RecoveryChartsPanelWidget.jsx
+++ b/frontend/src/components/dashboard-widgets/RecoveryChartsPanelWidget.jsx
@@ -1,9 +1,9 @@
 import { useNavigate } from 'react-router-dom'
-import RecoveryCharts from '../RecoveryCharts'
+import RecoveryDashboardOverview from '../RecoveryDashboardOverview'
 import { normalizeBodyChartDays } from '../../widgetSystem/bodyChartDays'
 
 /**
- * Erholung R1–R5 (wie Verlauf Erholung).
+ * Erholung Layer 2b (ein Bundle-Request). Link zum Verlauf unter Fitness.
  * @param {{ refreshTick?: number, chartDays?: number }} props
  */
 export default function RecoveryChartsPanelWidget({ refreshTick = 0, chartDays }) {
@@ -11,22 +11,22 @@ export default function RecoveryChartsPanelWidget({ refreshTick = 0, chartDays }
   const days = chartDays != null ? normalizeBodyChartDays(chartDays) : 28
 
   return (
-    <div className="card section-gap" style={{ marginBottom: 16 }}>
+    <div style={{ marginBottom: 16 }}>
       <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center', marginBottom: 10 }}>
         <div>
-          <div style={{ fontSize: 14, fontWeight: 700, color: 'var(--text1)' }}>Erholung — Charts</div>
+          <div style={{ fontSize: 14, fontWeight: 700, color: 'var(--text1)' }}>Erholung — Übersicht</div>
           <div style={{ fontSize: 12, color: 'var(--text3)' }}>Schlaf, Recovery, Vitalwerte · {days} Tage</div>
         </div>
         <button
           type="button"
           className="btn btn-secondary"
           style={{ fontSize: 12, padding: '6px 12px' }}
-          onClick={() => nav('/history', { state: { tab: 'recovery' } })}
+          onClick={() => nav('/history', { state: { tab: 'activity' } })}
         >
           Verlauf →
         </button>
       </div>
-      <RecoveryCharts key={`${refreshTick}-${days}`} days={days} />
+      <RecoveryDashboardOverview key={`${refreshTick}-${days}`} period={days} hidePeriodSelector />
     </div>
   )
 }
diff --git a/frontend/src/pages/History.jsx b/frontend/src/pages/History.jsx
index c6f4591..36c73bf 100644
--- a/frontend/src/pages/History.jsx
+++ b/frontend/src/pages/History.jsx
@@ -13,9 +13,9 @@ import { getBfCategory } from '../utils/calc'
 import { getStatusColor, getStatusBg } from '../utils/interpret'
 import { MACRO_CHART, macroFillByName, NUTRITION_MACRO_CHART_BLOCK_PX } from '../utils/macroChartTheme'
 import Markdown from '../utils/Markdown'
-import TrainingTypeDistribution from '../components/TrainingTypeDistribution'
+import FitnessDashboardOverview from '../components/FitnessDashboardOverview'
 import NutritionCharts, { WeeklyMacroDistributionPanel } from '../components/NutritionCharts'
-import RecoveryCharts from '../components/RecoveryCharts'
+import RecoveryDashboardOverview from '../components/RecoveryDashboardOverview'
 import KpiTilesOverview from '../components/KpiTilesOverview'
 import dayjs from 'dayjs'
 import 'dayjs/locale/de'
@@ -328,10 +328,10 @@ function InsightBox({ insights, slugs, onRequest, loading }) {
   const [expanded, setExpanded] = useState(null)
   const relevant = insights?.filter(i=>slugs.includes(i.scope))||[]
   const LABELS = {gesamt:'Gesamt',koerper:'Komposition',ernaehrung:'Ernährung',
-    aktivitaet:'Aktivität',gesundheit:'Gesundheit',ziele:'Ziele',
+    aktivitaet:'Fitness',gesundheit:'Gesundheit',ziele:'Ziele',
     pipeline:'🔬 Mehrstufige Analyse',
     pipeline_body:'Pipeline Körper',pipeline_nutrition:'Pipeline Ernährung',
-    pipeline_activity:'Pipeline Aktivität',pipeline_synthesis:'Pipeline Synthese',
+    pipeline_activity:'Pipeline Fitness',pipeline_synthesis:'Pipeline Synthese',
     pipeline_goals:'Pipeline Ziele'}
   return (
     <div style={{marginTop:14}}>
@@ -535,7 +535,7 @@ function BodySection({ profile, insights, onRequest, loadingSlug, filterActiveSl
       <BodyGoalsStrip grouped={groupedGoals} />
 
       <p style={{ fontSize: 11, color: 'var(--text3)', lineHeight: 1.45, marginBottom: 10 }}>
-        Daten und Kennzahlen aus dem Backend-Bundle (gleiche Quelle wie Platzhalter). Training: <strong>Verlauf → Aktivität</strong>.
+        Daten und Kennzahlen aus dem Backend-Bundle (gleiche Quelle wie Platzhalter). Training: <strong>Verlauf → Fitness</strong>.
       </p>
 
       {viz?.meta?.layer_2a_alignment && (
@@ -1097,48 +1097,30 @@ function NutritionSection({ profile, insights, onRequest, loadingSlug, filterAct
   )
 }
 
-// ── Activity Section ──────────────────────────────────────────────────────────
+// ── Activity Section — nur Layer-2b-Bundle (+ KI-Insights), keine parallelen Client-Charts ─
 function ActivitySection({ activities, insights, onRequest, loadingSlug, filterActiveSlugs, globalQualityLevel }) {
   const [period, setPeriod] = useState(30)
-  if (!activities?.length) return (
-    <EmptySection text="Noch keine Aktivitätsdaten." to="/activity" toLabel="Aktivität erfassen"/>
-  )
-  const cutoff = dayjs().subtract(period,'day').format('YYYY-MM-DD')
-
-  // Issue #31: Backend already filters by global quality level - only filter by period here
-  const filtA = activities.filter(d => period === 9999 || d.date >= cutoff)
-
-  const byDate={}
-  filtA.forEach(a=>{ byDate[a.date]=(byDate[a.date]||0)+(a.kcal_active||0) })
-  const cd=Object.entries(byDate).sort((a,b)=>a[0].localeCompare(b[0])).map(([date,kcal])=>({date:fmtDate(date),kcal:Math.round(kcal)}))
-
-  const totalKcal=Math.round(filtA.reduce((s,a)=>s+(a.kcal_active||0),0))
-  const totalMin =Math.round(filtA.reduce((s,a)=>s+(a.duration_min||0),0))
-  const hrData   =filtA.filter(a=>a.hr_avg)
-  const avgHr    =hrData.length?Math.round(hrData.reduce((s,a)=>s+a.hr_avg,0)/hrData.length):null
-  const types={}; filtA.forEach(a=>{ types[a.activity_type]=(types[a.activity_type]||0)+1 })
-  const topTypes=Object.entries(types).sort((a,b)=>b[1]-a[1])
-
-  const daysWithAct=new Set(filtA.map(a=>a.date)).size
-  const totalDays=Math.min(period,dayjs().diff(dayjs(filtA[filtA.length-1]?.date),'day')+1)
-  const consistency=totalDays>0?Math.round(daysWithAct/totalDays*100):0
-  const actRules=[{
-    status:consistency>=70?'good':consistency>=40?'warn':'bad',
-    icon:'📅', category:'Konsistenz',
-    title:`${consistency}% aktive Tage (${daysWithAct}/${Math.min(period,30)} Tage)`,
-    detail:consistency>=70?'Ausgezeichnete Regelmäßigkeit.':consistency>=40?'Ziel: 4–5 Einheiten/Woche.':'Mehr Regelmäßigkeit empfohlen.',
-    value:consistency+'%'
-  }]
+  const actList = activities || []
+  const hasList = actList.length > 0
 
   return (
     <div>
-      <SectionHeader title="🏋️ Aktivität" to="/activity" toLabel="Alle Einträge" lastUpdated={activities[0]?.date}/>
+      <SectionHeader title="🏋️ Fitness" to="/activity" toLabel="Alle Einträge" lastUpdated={actList[0]?.date}/>
       <PeriodSelector value={period} onChange={setPeriod}/>
+      <p style={{ fontSize: 11, color: 'var(--text3)', lineHeight: 1.45, marginBottom: 10 }}>
+        Fitness und Erholung aus den Data-Layer-Bundles (Issue 53). Zeitraum-Buttons steuern beide Bereiche gleichzeitig.
+      </p>
+      <FitnessDashboardOverview period={period} onPeriodChange={setPeriod} hidePeriodSelector />
 
-      {/* Issue #31: Show active global quality filter */}
-      {globalQualityLevel && globalQualityLevel !== 'all' && (
+      <div style={{ fontSize: 12, fontWeight: 600, color: 'var(--text3)', marginBottom: 8, marginTop: 20 }}>
+        Erholung (Schlaf, HRV, Vitalwerte)
+      </div>
+      <RecoveryDashboardOverview period={period} onPeriodChange={setPeriod} hidePeriodSelector />
+
+      {hasList && globalQualityLevel && globalQualityLevel !== 'all' && (
         <div style={{
-          marginBottom:12, padding:'8px 12px', borderRadius:8,
+          marginTop: 12,
+          marginBottom: 12, padding:'8px 12px', borderRadius:8,
           background:'var(--surface2)', border:'1px solid var(--border)',
           fontSize:12, color:'var(--text2)', display:'flex', alignItems:'center', gap:8
         }}>
@@ -1156,49 +1138,12 @@ function ActivitySection({ activities, insights, onRequest, loadingSlug, filterA
         </div>
       )}
 
-      <div style={{display:'flex',gap:6,marginBottom:12}}>
-        {[['Trainings',filtA.length,'var(--text1)'],['Kcal',totalKcal,'#EF9F27'],
-          ['Stunden',Math.round(totalMin/60*10)/10,'#378ADD'],
-          avgHr?['Ø HF',avgHr+' bpm','#D85A30']:null].filter(Boolean).map(([l,v,c])=>(
-          <div key={l} style={{flex:1,background:'var(--surface2)',borderRadius:8,padding:'8px 6px',textAlign:'center'}}>
-            <div style={{fontSize:14,fontWeight:700,color:c}}>{v}</div>
-            <div style={{fontSize:9,color:'var(--text3)'}}>{l}</div>
-          </div>
-        ))}
-      </div>
-      <div className="card" style={{marginBottom:12}}>
-        <div style={{fontSize:12,fontWeight:600,color:'var(--text3)',marginBottom:8}}>Aktive Kalorien / Tag</div>
-        <ResponsiveContainer width="100%" height={150}>
-          <BarChart data={cd} margin={{top:4,right:8,bottom:0,left:-20}}>
-            <CartesianGrid stroke="var(--border)" strokeDasharray="3 3"/>
-            <XAxis dataKey="date" tick={{fontSize:9,fill:'var(--text3)'}} tickLine={false}
-              interval={Math.max(0,Math.floor(cd.length/6)-1)}/>
-            <YAxis tick={{fontSize:9,fill:'var(--text3)'}} tickLine={false}/>
-            <Tooltip contentStyle={{background:'var(--surface)',border:'1px solid var(--border)',borderRadius:8,fontSize:11}}
-              formatter={v=>[`${v} kcal`]}/>
-            <Bar dataKey="kcal" fill="#EF9F2788" radius={[3,3,0,0]}/>
-          </BarChart>
-        </ResponsiveContainer>
-      </div>
-      <div className="card" style={{marginBottom:12}}>
-        <div style={{fontSize:12,fontWeight:600,color:'var(--text3)',marginBottom:8}}>Trainingsarten</div>
-        {topTypes.map(([type,count])=>(
-          <div key={type} style={{display:'flex',alignItems:'center',gap:8,padding:'4px 0',borderBottom:'1px solid var(--border)'}}>
-            <div style={{flex:1,fontSize:13}}>{type}</div>
-            <div style={{fontSize:12,color:'var(--text3)'}}>{count}×</div>
-            <div style={{width:Math.max(4,Math.round(count/filtA.length*80)),height:6,background:'#EF9F2788',borderRadius:3}}/>
-          </div>
-        ))}
-      </div>
-      <div className="card" style={{marginBottom:12}}>
-        <div style={{fontSize:12,fontWeight:600,color:'var(--text3)',marginBottom:8}}>Trainingstyp-Verteilung</div>
-        <TrainingTypeDistribution days={period === 9999 ? 365 : period} />
-      </div>
-      <div style={{marginBottom:12}}>
-        <div style={{fontSize:12,fontWeight:600,color:'var(--text3)',marginBottom:8}}>BEWERTUNG</div>
-        {actRules.map((item,i)=><RuleCard key={i} item={item}/>)}
-      </div>
-      <InsightBox insights={insights} slugs={filterActiveSlugs(['aktivitaet'])} onRequest={onRequest} loading={loadingSlug}/>
+      <InsightBox
+        insights={insights}
+        slugs={filterActiveSlugs(['aktivitaet', 'gesundheit'])}
+        onRequest={onRequest}
+        loading={loadingSlug}
+      />
     </div>
   )
 }
@@ -1494,32 +1439,10 @@ function PhotoGrid() {
 }
 
 // ── Main ──────────────────────────────────────────────────────────────────────
-// ── Recovery Section ──────────────────────────────────────────────────────────
-function RecoverySection({ insights, onRequest, loadingSlug, filterActiveSlugs }) {
-  const [period, setPeriod] = useState(28)
-
-  return (
-    <div>
-      <SectionHeader title="😴 Erholung & Vitalwerte" to="/vitals" toLabel="Daten"/>
-      <PeriodSelector value={period} onChange={setPeriod}/>
-
-      <div style={{marginBottom:12,fontSize:13,color:'var(--text2)',lineHeight:1.6}}>
-        Erholung, Schlaf, HRV, Ruhepuls und weitere Vitalwerte im Überblick.
-      </div>
-
-      {/* Recovery Charts (Phase 0c) */}
-      <RecoveryCharts days={period === 9999 ? 90 : period} />
-
-      <InsightBox insights={insights} slugs={filterActiveSlugs(['gesundheit'])} onRequest={onRequest} loading={loadingSlug}/>
-    </div>
-  )
-}
-
 const TABS = [
   { id:'body',        label:'⚖️ Körper'     },
   { id:'nutrition',   label:'🍽️ Ernährung'  },
-  { id:'activity',    label:'🏋️ Aktivität'  },
-  { id:'recovery',    label:'😴 Erholung'    },
+  { id:'activity',    label:'🏋️ Fitness'  },
   { id:'correlation', label:'🔗 Korrelation' },
   { id:'photos',      label:'📷 Fotos'       },
 ]
@@ -1559,6 +1482,10 @@ export default function History() {
 
   useEffect(() => {
     const t = location.state?.tab
+    if (t === 'recovery') {
+      setTab('activity')
+      return
+    }
     if (t && TABS.some(x => x.id === t)) setTab(t)
   }, [location.state?.tab])
 
@@ -1606,7 +1533,6 @@ export default function History() {
           {tab==='body'        && <BodySection profile={profile} {...sp}/>}
           {tab==='nutrition'   && <NutritionSection profile={profile} {...sp}/>}
           {tab==='activity'    && <ActivitySection  activities={activities} globalQualityLevel={activeProfile?.quality_filter_level} {...sp}/>}
-          {tab==='recovery'    && <RecoverySection  {...sp}/>}
           {tab==='correlation' && <CorrelationSection corrData={corrData} profile={profile} {...sp}/>}
           {tab==='photos'      && <PhotoGrid/>}
         </div>
diff --git a/frontend/src/utils/api.js b/frontend/src/utils/api.js
index c55e583..18ba7e9 100644
--- a/frontend/src/utils/api.js
+++ b/frontend/src/utils/api.js
@@ -639,6 +639,10 @@ export const api = {
   getBodyHistoryViz:                  (days=90)  => req(`/charts/body-history-viz?days=${days}`),
   /** Layer 2b: Verlauf Ernährung — Kennzahlen, Reihen, TDEE, Wochen-Chart (nutrition_metrics) */
   getNutritionHistoryViz:             (days=90)  => req(`/charts/nutrition-history-viz?days=${days}`),
+  /** Layer 2b: Fitness-Übersicht — KPI + Volumen/Typ-Charts (activity_metrics) */
+  getFitnessDashboardViz:             (days=28)  => req(`/charts/fitness-dashboard-viz?days=${days}`),
+  /** Layer 2b: Erholung — KPI, Insights, Charts R1–R5 (recovery_metrics) */
+  getRecoveryDashboardViz:            (days=28)  => req(`/charts/recovery-dashboard-viz?days=${days}`),
   getEnergyBalanceChart:              (days=28)  => req(`/charts/energy-balance?days=${days}`),
   getProteinAdequacyChart:            (days=28)  => req(`/charts/protein-adequacy?days=${days}`),
   getNutritionConsistencyChart:       (days=28)  => req(`/charts/nutrition-consistency?days=${days}`),