Apple Health Tripled Distance: Apple Watch + Strava
Record only in the Apple Watch Workout app and turn off Strava's write-back to Health, which has no de-dup.
Diagnosis
Apple Health is multiplying your distance because the watch, your phone, and Strava can each write the same run into Health — and Apple Health has NO de-duplication, so every writer adds its own copy. Record only in the Apple Watch Workout app, and turn off Strava's write-back to Apple Health.
Your setup at a glance
| Role | Assigned to | Why |
|---|---|---|
| Source of truth / recorder | Apple Watch | The native Workout app records the run. |
| Destination | Strava | Shares the run — but should not write back to Health. |
| Destination | Apple Health / Fitness | Your health database — should hold exactly one copy. |
Data route
This is the fix: which connections to keep and which to switch off.
✅ Enable these
- Apple Watch → Strava (the run) — One run, recorded by the watch, shared to Strava.
❌ Disable these
- Strava → Apple Health / Fitness — Strava writing back to Health double-counts the distance (Health has no de-dup).
During the workout
Do start
- ✓Start the run from the Workout app on the Apple Watch (Outdoor Run).
Don't start
- ✕Don't also record the same run with a second app on the iPhone.
- ✕Don't carry-and-record on the phone while the watch records — that's a second distance source.
Step-by-step setup
Account links
- In Strava, turn OFF 'Write activities to Apple Health' (Strava → Settings → Applications, Services & Devices → Health).
Device settings
- Record runs with the Apple Watch Workout app — not a third-party app recording in parallel.
- In Apple Health → Profile → Apps, limit which apps may WRITE workouts/distance (ideally just the Workout app).
During each workout
- One run = one Workout-app session on the watch.
Verify it worked
- Check Apple Health → Distance for the day shows the run ONCE, and Strava shows one run.
⚠️ Duplicate-risk warnings
Apple Health triple-counts distance (watch + phone + Strava write-back) — it has no de-dup layer.
Fix: Record only in the Workout app; turn off Strava's write to Health; stop any phone-side recording.
What data to trust
- Trust Apple Watchfor the run's distance, pace and heart rate (the single recorded source).
- Trust Apple Health / Fitnessfor your daily totals — but only once a single app is allowed to write them.
You'll know it worked when…
Apple Health shows the run's distance once (not 2–3×), and Strava shows a single run.
Frequently asked questions
Why is my running distance doubled or tripled in Apple Health?
Apple Health has no de-duplication, so the watch, your iPhone, and Strava's write-back can each add a copy. Record only in the Apple Watch Workout app and turn off Strava → Apple Health.
How do I stop Strava writing activities to Apple Health?
In Strava: Settings → Applications, Services & Devices → Health → turn off 'Write activities to Apple Health'.
Which app should I trust for my run distance?
Trust the Apple Watch Workout app — the single recorder. Apple Health daily totals are reliable only once you limit which apps can write workouts and distance.
Verified against: Strava ↔ Apple Health write-back (support.strava.com) · Apple Health sources / no de-dup (support.apple.com)