The purpose is to increase the jumping height by bending the ribs inward and downward when jumping. Rib bounce is a special skill, and the principle of this skill involves body dynamics and physics. When the ribs bend inward and downward, the center of gravity of the body will sag downward, and at the same time, the accumulation of elastic potential energy will be increased, which will generate greater thrust in the process of elastic release, thus improving the jumping height. In addition, this method also helps to reduce the rotation of the upper body and make the jump more stable.