Anyone noticed big changes with calorie calculation in the workout app with OS2 GM? On OS1 i would do (for example) 20 minutes fairly high intensity on the cross trainer and get active calories of about 150-200, on OS2 i get 90-100 at best. This is quite annoying, but maybe is more accurate - i don't really know. I also noticed on OS2 just walking about during the day seems to count a lot towards my exercise goal, whereas on OS1 it rarely registered more than 1 or 2 minutes. Now its more like 10-15 minutes.
As a side note, anyone upgrading to GM please learn from my mistake. I did not realise all health data is only backed up if you use encrypted backup in iTunes. After restoring to iOS9 and the most recent backup i lost all my health data & achievements, including filling all rings every single day since launch 🙁