I just got a fitbit zip today and I am confused if I need to take the fitbit off while I am working out at the gym and using a HRM? I dont want to end up double counting calories burned. I got the fitbit zip so I could make myself more motivated to move during the day. My HRM does not sync, so I manually add the calories burned. Do I just take the fitbit off while I workout (treadmill, elliptical etc) and once I'm done at the gym, put the fitbit back on? Thanks for any help!