Apple Watch Treadmill Walking Tracking

Howdy schumanjs,

Yes, the Apple Watch will track your indoor walk on a treadmill. You can help the accuracy of the Apple Watch by calibrating it, and also using the Indoor Walk workout in the Workout app.

Calibrating your Apple Watch for improved Workout and Activity accuracy - Apple Support

Use the Workout app on Apple Watch - Apple Support

Have a great weekend,

Alex H.

no modifications. It will work just fine to record steps and heart rate, but your distance is tied to the GPS, so it probably wouldn't have a good estimate of your distance traveled. You would only want to tell the watch your about to do a work out before starting in the fitness tracking app.