No matter you're working or exercising, you are overusing your gripping muscles while under-using your expanding muscles. Expanding muscles are the muscles that open your hands. Lacking of training these muscles cause imbalances that hurt performance & can cause pain & injuries such as carpal tunnel syndrome and tennis elbow. If you are musicians, golfers, computer workers, tennis players, baseball players, rock climbers, weight lifters, or if you drive, text or type, Try our finger exerciser. Build Strength, designed to increase the strength of fingers, wrists and forearms. Improve strength for weak hands - Improves strength, prevents stiffness and relieves joint pain.