Power Twister bar Hand Strengtheners Fitness Expander hand gripper arm trainer spring bar 50KG

Product information: Materials: High Quality Carbon Steel Springs and Non-Slip Plastic Handle. Suitable for people: young, adult,Fitness beginner SIZE: 30KG 40KG 50KG function: Exercise shoulder, arm and back muscles to make the body healthier and stronger,Strengthens the chest, back, shoulders, biceps and grip Perfect for building upper body strength. Method: 1.Bend both arms and bend the spring hard behind the neck 2.Two arms forward, bend the spring upward, and then relax. 3.The arms converge toward the chest, bend the springs, then straighten out and relax slowly. 4.Stand, two feet apart, bend your right elbow, bend the spring with your left hand, then bend your left elbow and bend the spring with your right hand. 5.Two arms to the behind, clench the spring, and then straighten down gradually bend.