I don't usually feel very comfortable wearing the watch when I go to the gym(the handlebars of the treadmill get in the way and when I swing my arms, they can easily hit handlebars)....I do bring my iPhone so I'm wondering if the activity app will function just the same? And sync up with the watch when it is in range? Or do I have to wear the watch for the activity app to work? Also when using weather as a complication on watch face, I heard it keeps location services on at all times on the phone therefore draining battery, as opposed to when it isn't a complication and location services aren't on at all times.....is this true? What about power reserve? Does it still track activity? What does it mean? What can the watch do and NOT do in this mode? I noticed that activity app only really does anything when you wear the watch...so if I have my phone in my pocket at the gym and not my watch on me, the activity app just does not do anything in terms of moving or exercising or standing.... I thought data would sync up when the iPhone was in range of the watch... But it doesn't Is there a way to reset activity data and erase it to start from beginning again?