I know I'm a fairly active guy but before the watch os2 update my exercise circle never moved unless I went for a run or something. Now daily it's done before I get out of work... Somethings changed!
Same here. My activity rings show more progress before I even get to the gym at night, as compared to OS1 where the rings moved mainly during physical exercise/heart rate changes.
I would agree that the exercise tracker seems more sensitive now. For example, every time I walk up the 2 flights of stairs to my office, I get 1 minute of exercise credit. Before OS2, I wasn't getting that.