That Exercise ring is a mystery and seems to have a mind of its own. For example, yesterday I went to the gym and did 45 minutes of weighs followed by a 35 minute run on a treadmill using the exercise app. The exercise ring showed a total of 24 minutes of exercise. While I wouldn't expect it to pick up much from the weight session, I did expect it to be close to all the time I was running. I have tried on other days tightening the watch band one hole (sport band) when I exercise, and that does seem to help in registering the exercise time more consistently. Does anyone know the exact criteria for the Apple Watch to consider what is exercise? Is it a percentage of maximum heart rate for an amount of time before it adds a minute etc?