The Beep Test, or Shuttle Run, has been used for years by everyone from the military, professional athletes, to people who simply want a more active and healthy lifestyle. It is used to calculate an athletes maximum oxygen uptake and fitness level.
Simply tap Start, and start running to a 20 metre mark. The app will beep to alert you to run back. If you dont make it to the mark before the next beep sounds, you fail and should tap Stop on your phone to set your time. If you set a new Personal Best, congratulations! If not, train hard and try again in a few days.