diff --git a/backend/migrations/011_allow_multiple_rest_days_per_date.sql b/backend/migrations/011_allow_multiple_rest_days_per_date.sql
new file mode 100644
index 0000000..81e269a
--- /dev/null
+++ b/backend/migrations/011_allow_multiple_rest_days_per_date.sql
@@ -0,0 +1,17 @@
+-- Migration 011: Allow Multiple Rest Days per Date
+-- v9d Phase 2a: Support for multi-dimensional rest (development routes)
+-- Date: 2026-03-22
+
+-- Remove UNIQUE constraint to allow multiple rest day types per date
+-- Use Case: Muscle recovery + Mental rest on same day
+-- Future: Development routes (Conditioning, Strength, Coordination, Mental, Mobility, Technique)
+
+ALTER TABLE rest_days
+DROP CONSTRAINT IF EXISTS unique_rest_day_per_profile;
+
+-- Add index for efficient queries (profile_id, date)
+CREATE INDEX IF NOT EXISTS idx_rest_days_profile_date_multi
+ON rest_days(profile_id, date DESC);
+
+-- Comment for documentation
+COMMENT ON TABLE rest_days IS 'v9d Phase 2a: Multi-dimensional rest days - multiple entries per date allowed for different development routes (muscle, cardio, mental, coordination, technique)';
diff --git a/frontend/src/pages/RestDaysPage.jsx b/frontend/src/pages/RestDaysPage.jsx
index 01728ab..d8ad303 100644
--- a/frontend/src/pages/RestDaysPage.jsx
+++ b/frontend/src/pages/RestDaysPage.jsx
@@ -62,11 +62,11 @@ const PRESETS = [
 ]
 
 const FOCUS_LABELS = {
-  muscle_recovery: '💪 Muskelregeneration',
-  cardio_recovery: '🏃 Cardio-Erholung',
-  mental_rest: '🧘 Mentale Erholung',
-  deload: '📉 Deload',
-  injury: '🩹 Verletzungspause',
+  muscle_recovery: 'Muskelregeneration',
+  cardio_recovery: 'Cardio-Erholung',
+  mental_rest: 'Mentale Erholung',
+  deload: 'Deload',
+  injury: 'Verletzungspause',
 }
 
 export default function RestDaysPage() {
@@ -434,7 +434,8 @@ export default function RestDaysPage() {
                     color: preset?.color || '#888',
                     marginBottom: day.note ? 8 : 0,
                   }}>
-                    {preset?.icon || '📅'} {FOCUS_LABELS[focus] || focus}
+                    <span style={{ fontSize: 14 }}>{preset?.icon || '📅'}</span>
+                    {FOCUS_LABELS[focus] || focus}
                   </div>
 
                   {/* Note */}