Watch and treadmill disagree
Why the numbers drift apart and which one to trust.
Today the app corrects treadmill distance. Version 2.0, being prepared, adds distance and calorie corrections for supported runs, walks, rides, swims and gym workouts, plus trimming, compatible joins and activity-type changes.

Why the numbers drift apart and which one to trust.
Why HealthKit will not edit distance in place, and what a corrected copy is.
Calibration, arm movement and the limits of wrist-based distance estimation.
Choose recorded or reliable GPS distance, correct supported elevation, review FIT imports. GPS points are never invented.


These screenshots show the earlier treadmill workflow. Updated 2.0 images are being prepared.

Apple Health does not offer a simple direct distance edit. Fix My Workout saves a corrected workout copy instead.
Yes. The correction flow runs on your device with Apple Health permissions. Only App Store purchases need Apple services.
Workout processing stays on-device. TelemetryDeck receives product events without health data. Exports and diagnostics are shared only when you choose.
Contact details and troubleshooting.
How the app uses Apple Health access and handles data.