The Gymboss is a small, easy to use, dual-mode, interval timer. This multi-use timer has many common features, so that it is conducive to almost any type of exercise program. No more watching the clock. You can Gymboss all the intensity of training, you exercise better and better as the center! Maximize your training to increase: Anaerobic endurance, aerobic endurance, increase maximum oxygen uptake, muscle strength / size and fat loss