Some fitness Xiaobai can not do pull-up, always feel that their arm strength is not enough, in fact, this is because your forehead and back muscle strength is not enough. < / P > < p > from the action mode, the “pull” action is the back muscles exerting force. Therefore, when you do the “pull” action and feel the lack of strength, that is, your back muscle strength is too weak, which is not what you think of as insufficient strength of the arm to pull. < / P > < p > there are many people’s dream of inverted triangle figure, which also requires you to enlarge the muscle shape of latissimus dorsi, so as to widen the upper line of the inverted triangle. According to the following four sets of training, we will start shaping the back. < / P > < p > ① stand facing the rope instrument, legs are the same width as the shoulder, fix the pulley anchor point to a high position, hold the cross bar handle with both hands straight arms upward, bend the legs slightly, and lean forward slightly. < / P > < p > ① sit facing the rope instrument, adjust the pulley anchor point to the height of the middle part of the body, grasp the V-shaped grip with both hands, extend the arm forward, and lean forward slightly. < / P > < p > 2) pull the upper body back to a position perpendicular to the ground, and then continue to pull the handle backward with both hands until the grip is close to the body, and then slowly extend the arm and lean forward slightly. Waistcoat line type abdominal abuse posture, shaping the perfect abdominal curve!