The parallel arms on the horizontal bar are pulled up by pull-ups. However, the arms are not just pulled up to the chin or chest touching the horizontal bar, but the whole body is lifted up to the waist touching the horizontal bar, and the arms support the body vertically. [1] Usually this action needs enough explosive force. With the help of rising inertia, the chest rises to the height of the horizontal bar, and then the arms and wrists turn over to support the action. [2] There is also the action of swinging back and forth, but it is closer to bending the bar.