fitness app

Tried rebooting? How to restart your Apple Watch - Apple Support

Failing that, you’re likely headed for a discussion with Apple.

Use the Get Support link in the upper right.

I had the same issue. This started June 11th, at approx 5:30am:

• My fitness app wouldn’t load on the watch (just a black screen with only the time showing in the top right hand corner)
• My rings data was not populating to the watch
• HR app could not detect heart rate
• battery would drain very fast (from 100 to 0 in about 5 hours)

Had a full chat with support and then at the apple genius bar the following day. Quick recap of all the steps that i was asked to do. It didn’t work for me but it might for you:

• update both watch and phone to latest watchos and ios
• restart watch and phone
• hard reset on both watch and phone
• unpair and repair your watch and restore from backup
• do the same if there’s an apple tv involved as well for fitness + 
• unpair and repair your watch and set up as new
• turn off background app refresh on watch
• turn off remove unnecessary apps from phone and watch
• sign out of phone and sign back into icloud

Unfortunately this did not fix it for me and i was informed that a few other people had the same issues. It was recommended that i wait for a fix to be pushed to my watch or a new update to be released and see if the problem persisted.

In the meantime my watch only lasts about 5 hours but i guess that’s why i have a portable charger.  Hope you can try some of this stuff and resolve your issues with your watch.