Fitness app not working in ios 16

Hi pmd32,

Thanks for coming to Apple Support Communities for help today.

Let's first check a few things that could be affecting the Fitness app on your iPhone.

1. Be sure an Apple Watch is not paired to the iPhone.
2. Be sure your Heath details (Date of birth, weight, height) are set correctly.
3. Are any Apple Watches listed in Settings > Apple ID > Devices?

We'd next suggest visiting Apple Support for a resolution if the issue continues.

Have a fantastic day!

I thought we didn’t need a Apple Watch In order to use the fitness app that’s why it became available with the new update?