Stability Coach it's your own 'stability trainer'. Product is highly recommended for rehabilitation as well as for any general conditioning exercises. It is made of high quality EVA foam coated by nano-structure, which is resistant of sweat. Air bubbles trapped in the foam, destabilize the position of practicing and force to actively seeking the point of body's balance. However, Stability Coach is more than just a coordination and body balance training. While exercising on stability coach we can safely strengthen as well as rehabilitate muscles tendons and knee ligaments, ankle, elbow, wrist and knee-joints. An anti-slip structure provides comfort of use.