How correction works
Pick the saved workout, enter the treadmill distance, and review the corrected copy.
Fix My Workout 2.0 is coming. Formerly Fix My Treadmill. The broader update is being prepared; available tools depend on the installed version. Its prepared App Store name is Fix My Workout: Treadmill.
Apple Watch treadmill distance wrong?
Fix wrong Apple Watch treadmill distance.
When your treadmill says 5.00 km but Apple Watch saves 4.62 km, Fix My Workout lets you enter the real distance, review pace and splits, and save a corrected copy to Apple Health.
Short answer
Why treadmill distance goes wrong on Apple Watch.
- Why it happens
Treadmill workouts cannot use GPS. Apple Watch estimates distance from motion, calibration, stride, pace history, and sensor data.
- Why it is hard to edit
Apple does not let third-party apps directly edit the original Apple Watch workout in place through HealthKit.
- The practical fix
Save a corrected workout copy, then open Apple Fitness and delete the original if you want to avoid double-counting.
How it works
Designed for one annoying treadmill problem.
Fix My Workout keeps the workflow small: pick the Apple Watch indoor run or walk, type the treadmill distance, preview the corrected result, and save it back to Apple Health.
- Pick the workout
Choose an Indoor Run or Indoor Walk already saved in Apple Health.
- Enter the real distance
Use the distance shown by the treadmill, then review the updated pace and splits before saving.
- Save a corrected copy
The original is not overwritten. Save prepares a new Health entry and checks its outcome. Review any additional omission or estimate. A pending check is not proof that no copy was written.
- Clean up the original
The App checks the saved copy before offering optional original-removal instructions. It never deletes the original automatically; decide only after checking the result.
Pace, splits, calories
Distance changes. Health signals stay honest.
Distance-based values such as pace and splits are recalculated from the corrected distance and available HealthKit timing data. When the original workout exposes laps, segments, or interval timing, the app tries to preserve that structure instead of flattening everything into one simple average.
The app includes several split recalculation methods: proportional scaling, final remainder adjustment, preserving structured laps or segments, duration-weighted distribution, and rebuilding clean 1 km or 1 mi splits.
Heart rate and calories are not guessed from distance. They are preserved from the Apple Watch workout where HealthKit allows it, because calories depend on heart rate, body metrics, duration, and Apple's own model.
Troubleshooting
Common Apple Watch treadmill distance problems.
Most treadmill mismatches are simple once you know which value should be the source of truth. Use the treadmill distance when you are correcting a finished indoor workout.
Apple Watch distance is too short
This often happens when your wrist motion is limited, your stride changes indoors, or you hold the treadmill rails. Enter the treadmill distance and let the app recalculate pace and splits.
Apple Watch distance is too long
If Apple Watch overestimates the workout, save a corrected copy with the shorter treadmill distance. Review the result before deleting the original workout.
Treadmill miles vs kilometers mismatch
Check the treadmill unit before saving. A 5.00 mile run is not the same as a 5.00 km run, and unit mistakes can make pace and weekly totals look wildly wrong.
Deleting the original workout
The corrected copy does not overwrite the Apple Watch original. If you want clean totals in Apple Fitness, delete the original only after confirming the corrected workout looks right.
FAQ
Common questions before changing a workout.
Why is my Apple Watch treadmill distance wrong?
Apple Watch estimates indoor run and walk distance from motion, calibration, stride, pace history, and sensor data. On a treadmill it cannot use GPS distance, so the saved distance can differ from the treadmill belt distance.
Can I edit Apple Watch treadmill distance after a workout?
Apple does not let third-party apps directly edit the original Apple Watch workout in place through HealthKit. Fix My Workout saves a corrected workout copy instead.
Will Apple Fitness show two workouts?
Yes, until you delete the original. Because the corrected workout is saved as a new Apple Health entry, you can delete the original Apple Watch workout in Apple Fitness if you want clean totals.
Does it work for indoor walks as well as indoor runs?
Yes. Fix My Workout is designed for Apple Watch Indoor Run and Indoor Walk workouts saved in Apple Health.
Does Fix My Workout change calories or heart rate?
For a distance-only correction, pace and compatible splits use the selected distance and available timing. Compatible heart rate and calories can be copied where HealthKit allows. The prepared 2.0 update also supports activity-appropriate calorie correction; additional omissions and estimates are disclosed.
Does this need an account?
No. There is no account, no ads, and no app backend. The correction workflow happens locally through Apple Health permissions on your iPhone.
Is it free?
The app includes 3 free fixes so you can test it on real workouts. Unlimited fixes are available with a one-time unlock, not a subscription.
What permissions are required?
The app needs permission to read workouts and related Health metrics, and permission to write corrected workouts back to Apple Health.
Fix My Workout
Try it on your next treadmill mismatch.
Correct inaccurate Apple Watch treadmill runs and walks, save a corrected copy to Apple Health, and keep your Fitness history cleaner.
Guide information
Written and reviewed by the app developer.
Dan Urbánek, the independent developer of Fix My Workout, wrote and reviewed this guide. Published May 29, 2026; last updated October 7, 2026.
The workflow describes completed indoor workouts saved through Apple Health. Apple and HealthKit behavior can change with iOS updates, so review the corrected copy before deleting the original.