I can't figure out how to turn the GPS off before starting an exercise. I tend to do my walking on a treadmill more than outside, but I don't see any way to tell the watch I'm at the gym on a treadmill and don't really need to have GPS track my activity. I would still like it logged under "Walking" though. Am I missing something? Any tips? It appears there may have been an "Indoor Running" activity at some point on the app, but I can't find it listed any more. Help. Thanks.