Heart rate during outdoor walk exercise is missing after the watch update
After I have updated The watchOS, the heart rate in the workout has gone missing in particular activity for example walk, while the core training is ok. How can I fixed this?
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The first (and simplest) thing to try if something isn’t working right is to restart your Apple Watch and its paired iPhone. If necessary (device not responding), try a forced restart. Both methods can be found here:
How to restart your Apple Watch - Apple Support
Restart your iPhone - Apple Support
If that doesn't help, the next steps would be to unpair and pair your watch again and restore from the backup:
Unpair and erase your Apple Watch - Apple Support
Set up your Apple Watch - Apple Support