VO2 Max stopped recording, tried everything
I regularly use my watch to track VO2 max and sit has completely stopped. I’ve tried everything including recalibrating, restart, full system reset. It refuses to track anymore. BUG.
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Force restart your watch i.e. press and hold both the side button and Digital Crown for at least 10 seconds, then release both buttons when you see the Apple logo.
Then while the Watch is restarting Force Restart the paired iPhone
Force restart iPhone - Apple Support
Your Apple Watch uses the personal information that you provide in Watch app, My Watch, Health, Health details, to help calculate metrics for your daily activity. You can further improve its accuracy using these tips.Get the most accurate measurements using your Apple Watch - Apple Support
If no better then Unpair the watch and then pair it again.
Unpair and erase your Apple Watch - Apple Support
Set up your Apple Watch - Apple Support