For the fellow trainers out there using the watch to play the game, what have you found works best for you? I've been trying to find the best way to use the watch app without it crashing or randomly stop counting distance. Do you keep the app on your phone open? Keep it closed? I've done both of these and sometimes it works, sometimes it doesn't. Also, does the game really need the heart monitor to be on for the whole game session? This app is the only reason I've had to charge my watch midway through the day, so anything that could cut the massive battery usage would be helpful. Is there a way to toggle this in the watch settings & still use the app affectively?