Pull-ups to assist elastic belt is an auxiliary device invented for this purpose. When doing pull-ups, hard pulling, rowing and other fitness actions, the back is not completely exhausted, but the finger grip strength is not enough to continue the follow-up actions (it can be simply understood that the arms and back are still strong, but the fingers can't hold them).

Pull-ups to exercise upper body muscles. Pull-ups need a certain grip strength and upper limb strength, and they must be able to overcome their own weight before they can be completed once. Pull-ups play an important role in developing the suspension strength, shoulder strap strength and grip strength of upper limbs.