Apple Watch exercise calculation I just walked on my treadmill for 20 minutes. I don't see anything in the exercise ring. How is the exercise time counted?
Have you tried calibrating your Apple Watch? According to the support article, Calibrating your Apple Watch for improved Workout and Activity accuracy, calibration helps improve accuracy of things like distance and pace when GPS is not available. An example of this would be when you are walking or running on a treadmill.