No heart rate sensor or special hardware required. Use any cardio machine. As seen on Wired, Engadget, Stephen Frys Gadget Man and more - BitGym upgrades your cardio machine with stunning interactive trails from around the world. Each tour can be streamed instantly or downloaded locally for use at the gym. - No hardware required - BitGym tracks your exercise speed by using the front-facing camera on your device. - Works on any bike, elliptical or treadmill - just place your phone or tablet down so youre in view and start exercising. - Our library of tours is available via streaming or local downloads. - View the tours to your TV using an HDMI cable or Miracast. - Constantly growing - BitGym will keep surprising you with new tours, workouts and other features. Like us on Facebook (http://www.facebook.com/bitgymfan) for updates on new content BitGym can be used in Trial mode for free or you can upgrade to Premium for $7.99 a month. You will not be charged unless you explicitly sign up for Premium and add a credit card. You can cancel at anytime however we do not offer partial refunds for canceled months. Notes: * In Trial mode, you can access one tour from each circuit. Change tours using the orange button at the top of the main menu. * BitGym Android does not support HRM integration. * If you have an external storage (SD card) in your device, offline tours will be downloaded to it by default. SD cards may not be detected for devices from certain manufacturers. * Because of the large number of Android device manufacturers, we cannot guarantee all features of the app will work perfectly on all devices. Please test all the features you are interested in with the free Trial mode before going premium.