The Polar H7 Bluetooth chest strap monitor can be worn for any fitness activity, but it seems to be best for runners and bikers. The Polar Beat app acts like a personal trainer in your palm. First, you set a goal — whether that’s beating a previous time or burning a certain number of calories. The app, in conjunction with the Polar H7 heart rate monitor, helps you stay on track of that goal throughout your workout with real-time data tracking and voice guidance. And you can still listen to music while the app is running.