Sudden drop or change in cardio fitness score (VO2 max) on your Apple
https://www.myhealthyapple.com/sudden-drop-or-change-in-cardio-fitness-score-vo2-max-on-your-apple-watch-and-iphone-health-app/
Re-calibrate your Apple Watch From your iPhone > Watch app > My Watch tab. Choose Privacy. Scroll down to choose Reset Fitness Calibration Data. Put on your watch and open the Workout app. Tap Outdoor Walk or Outdoor Run. Go for a 20-minute outdoor run or walk on a flat surface–try to maintain a constant speed on your walk or run.
From your iPhone > Watch app > My Watch tab.
Choose Privacy.
Scroll down to choose Reset Fitness Calibration Data.
Put on your watch and open the Workout app. Tap Outdoor Walk or Outdoor Run.
Go for a 20-minute outdoor run or walk on a flat surface–try to maintain a constant speed on your walk or run.
DA: 26 PA: 59 MOZ Rank: 24