Phase 06 — Implementation Priorities

🎯 FOKUS: FUNKTIONALITET ÖVER DESIGN

Tier 1: MUST HAVE (IMPLEMENTERA NU)

06-01: Workout Swap System ✅

API: POST /api/workouts/:id/swap (swap with another workout)
API: GET /api/workouts/available (list swappable workouts)
UI: Button "Byt pass" on workout page
Database: Track swap history
Reversible swaps (undo)

06-02: Muscle Group Recovery Tracking ✅

Calculate: last workout date per muscle group
Calculate: recovery score (0-100%)
Display: recovery % on each muscle group
API: GET /api/recovery/muscle-groups (current status)
Database: muscle_group_recovery table

06-03: Smart Workout Recommendations ✅

Algorithm: Which muscle groups are most recovered?
Suggest: 2-3 workouts targeting recovered groups
API: GET /api/recommendations/smart-workout
Avoid: Overtraining same groups <48h
One-tap: "Use this recommendation"

Tier 2: SHOULD HAVE (EFTER TIER 1)

06-04: Dashboard Analytics

Show: Weekly workout count
Show: Total volume (kg)
Show: Strength score trend
Show: Muscle group activity heatmap
API: GET /api/analytics/dashboard

06-05: Library Improvements

Search exercises
Filter by muscle group
Show exercise details + form tips
Categorize: Weights, Bodyweight, Cardio

Tier 3: NICE TO HAVE (LATER)

06-06: Achievement Badges 06-07: Social Features 06-08: Advanced Analytics

📋 Implementation Order

Backend First — Recovery tracking + APIs
Frontend Second — UI for swap + recommendations
Integration — Connect frontend to backend
Testing — E2E validation

⚡ Quick Wins

Task 06-01 Implementation:

Backend:
- Add swapped_from_id to workout_logs
- POST /api/workouts/:id/swap endpoint
- GET /api/workouts/available endpoint

Frontend:
- Add "Byt pass" button to WorkoutPage
- Simple modal: pick another workout
- Confirm swap action

Task 06-02 Implementation:

Backend:
- Calculate recovery per muscle group
- GET /api/recovery/muscle-groups endpoint
- Store in muscle_group_recovery table

Frontend:
- Display recovery % as number/badge
- Color code: red (0-33%), yellow (34-66%), green (67-100%)
- Update real-time when workout logged

Task 06-03 Implementation:

Backend:
- Analyze last 7 days: which muscles trained?
- Find most-recovered muscle groups
- GET /api/recommendations/smart-workout
- Return 2-3 workouts + reason

Frontend:
- "Byt till rekommenderat pass" button
- Show: "Du är väl återhämtad för [muscle group]"
- One-tap action

Philosophy: Function > Form. Build working features first. Polish UI later.

Timeline: 6-8 hours for Tier 1 (parallel backend + frontend)

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