Great for serious workouts. (Not for calorie counting)

Started using this app about a month ago with the 60beat BLUE chest strap and it has worked flawlessly. Syncs up in a couple of seconds and is accurate. I have used it for P90x,P90x+, running and even tried it with yoga. Only minor issue with chest strap is if contacts do not stay moist it might lose Bluetooth connection. (Just means you have to work harder and sweat more).

Bink90x about 60beat Heart Rate Monitor