When I walk 45 minutes my watch doesnot register 45 min of activity but only 20 minutes or 18 minutes at times so the green circle is not full, green circle of training is set on 30 minutes a day. When I check the overview it does say the exact minutes that I trained. Does anybodynknow why this happens? I added two pictures to explain. First picture 45 walking second picture green circle 30 minutes not full.
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.or 5.3kph or 11.3 minutes per kilometer.
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.
Registration of apple watch activities
