Abstract: The present invention relates to an exercise device that allows the user to strengthen the muscles that close the hand, against the resistance of a flexion member, as well as to strengthen the muscles that open the hand and spread the digits, against resistance of an extension member, all through full natural planes of motion, without lulls of resistance during the exercise. The device is always taut, due to its unique design, either resisting finger and thumb flexion and adduction or finger and thumb extension and abduction. The result of consistent use is maximum strength, balance and blood flow to the hand, wrist, forearm and elbow.