Will Apple Fitness show two workouts?
Yes, until you delete the original. Because Apple does not allow direct edits, the corrected workout is saved as a new entry.
Apple Watch treadmill distance wrong?
Fix Apple Watch treadmill distance.
When your treadmill says 5.00 km but Apple Watch saves 4.62 km, Fix My Treadmill 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.
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Why it happens
Treadmill workouts cannot use GPS. Apple Watch estimates distance from motion, calibration, stride, pace history, and sensor data.
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Why it is hard to edit
Apple does not let third-party apps directly edit the original Apple Watch workout in place through HealthKit.
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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 Treadmill 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.
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Pick the workout
Choose an Indoor Run or Indoor Walk already saved in Apple Health.
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Enter the real distance
Use the distance shown by the treadmill, then review the updated pace and splits before saving.
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Save a corrected copy
The original is not overwritten. The corrected workout is saved as a new Health entry with correction metadata.
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Clean up the original
The app guides you to Apple Fitness so you can delete the original workout if you want clean totals.
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.
FAQ
Common questions before changing a workout.
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 Treadmill
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.