Apple watch
When I work out my Apple Watch will not track the calories I have burnt
Apple Watch
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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
You should also make sure your watch is calibrated:
Calibrating your Apple Watch for improved Workout and Activity accuracy - Apple Support
Also, see the solution to:
apple watch series 5 activity recording n… - Apple Community