My watch does not always record the number of minutes I walk? Why does it record correctly sometimes?
Why does my watch not always record the correct number of minutes when I do my daily walk?
Apple Watch Series 3, watchOS 7
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To earn exercise or workout credit you must move at the speed of a brisk walk.
To earn 1 minute of exercise credit(green ring);
Travel a full minute at a brisk walking pace 3.3 mph or 18 minutes per mile approx.
Raise your heart rate to approx 75% of your maximum.
When you're at around or above this heart rate and speed for the entire minute you'll receive 1 exercise minute credit.
If you pause or slow down during this minute then you won't get any exercise credit for that minute,it will still measure your steps and calories burnt but will not give you any credit towards the exercise ring.
Source;Successful phone call I had with apple support.