[aspenmayer]

https://support.apple.com/en-us/105048

> Reset your calibration data

> Here's how to reset your calibration data:

> On your iPhone, open the Watch app.

> Tap the My Watch tab, then tap Privacy > Reset Fitness Calibration Data.

[vegardx]

I'm going to chalk this up to the decline in Google search to save my embarrassment, because that was very straight forward, and I don't understand how I didn't find that. Admittedly, it's a couple of years since I looked and it could be a new feature.

Funnily enough one of the demonstrated use-cases of Apple Intelligence was looking up information like this.

[aspenmayer]

Check this other support page too, as you may need to enable wrist detection to resolve some of the other issues you described.

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

[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