An application that allow you to practice your exercises freely without need any kind of sensors to observe your results. The application give you the opportunity to control your exercises and see all statistics results on you device without other equipments or softwares.
The GPS and the accelerometer in your device allow you with precision to collect the position, speed, altitude and time spent on your exercises and to complement you could see the calories consumed.
Note: "Continued use of GPS running in the background can dramatically decrease battery life."