Grip Ball Hook 70 The most successful athletes can change their planned movement during the race to move efficiently to the target. You can intelligently include muscle groups to save energy for the so-called future challenges before the race. This training device is the ideal training partner to extremely strengthen your grip muscles, the muscles of the entire upper arms, the shoulder girdle and the broad back muscles. You can order the existing construction or the construction you buy from us. Color: matt black with a fine structure for better grip Material: steel.