[teemaw]

I understand this will reset motion calibration data but does anyone know if heart rate measurements also use calibration data? My Ultra 2 always seems to undercount my heart rate compared to my older Series 6. This is especially noticeable during higher intensity workouts.

[aspenmayer]

There’s some info that may help you and the original person I replied to at this other support page as well:

https://support.apple.com/en-us/105002