For years now; core training (the idea of strengthening a group of muscles that support the primary muscles involved in specific activities) has been the leading edge of fitness training philosophy. This type of training is often associated with hips, back and abdominal areas of the body.
Leading information now employs the thought that core training muscles exist throughout the body depending upon which area of the body is in motion. The Xtensor is the core training tool for the hands, wrists and elbows. No other device is better designed to exercise the muscles that stablize the wrist and elbows which until now have been virtually off limits core training principles. Strengthening the muscles that open the hands is on the leading edge in helping to prevent overuse injuries that effect the performance of millions of golfers and tennis players every year.