Apples n' Stone
macrumors 65816
Stand just requires you to stand and move around for at least a minute each hour. I find that the Watch will remind you to stand when there's 10 minutes left in the hour and you haven't stood up.
For me, stand is the easiest to fill. It even on a 11 hour flight from Paris to LAX, I stood up every hour to make sure to hit my goal, luckily I was on an aisle.
The exercise ring is the toughest for me, since it requires exercise. (go figure) but the rings are motivating me for sure.
The only reason it becomes a problem, is when you have two two-hour exams back to back. No breaks, but thanks to how I am not allowed digital watches in exams I have to take off the watch before hand. So I end up losing about six hours a day of usage, nice for the battery, bad for fitness tracking :/