Please forgive what may sound like a dumb questions, but when I start an activity on my Active 2, I cannot figure out how to stop it. I know that once started, it detects continuous movement (hiking in my case), but when I'm back to my car, the clock continues to run and there seems to be no way to stop the activity. Even if I just sit for a spell, it rolls on. Can't find a way to stop it on the phone app either. Thanks for any assistance you all can lend.