People generally think that stretching is a kind of lazy performance, in fact, stretching, the body has a lot of benefits. Stretching is to raise the elbow of the arm upward over the chest of a movement. The role of stretching 1, cause most of the muscles of the whole body stronger contraction, in the last few seconds, will be a lot of stagnant stagnant blood drive back to the heart, increase the amount of blood circulation, improve blood circulation; 2, it can make the neck blood vessels Shu Shu to the brain, so that the brain can get enough nutrition, so as to eliminate fatigue, invigorate the spirit of the spirit; 3, to increase the amount of oxygen inhalation, exhale more carbon dioxide, promote the Body metabolism; 4, so that the whole body muscles, especially the waist muscles in the rhythmic expansion and contraction of the balance, and gradually developed and strong, to prevent lumbar muscle strain; 5, in time to correct the excessive forward curvature of the spine, to maintain a healthy body type.