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> 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.

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.

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

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.

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

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