People generally think that stretching is a sign of laziness, but in fact, stretching is good for the body in many ways. Stretching is a movement that raises the elbow of the arm upwards over the chest. The role of stretching 1, cause most of the muscles in the body stronger contraction, in just a few seconds, will be a lot of stagnant blood back to the heart, increase the amount of blood circulation, improve blood circulation; 2, it can make the blood vessels in the neck comfortably transport blood to the brain, so that the brain can get enough nutrients to eliminate fatigue, invigorate the spirit; 3, increase the amount of oxygen intake, exhale more carbon dioxide, promote body metabolism; 4, so that the whole body muscles, especially the lumbar muscles in the rhythmic expansion and contraction of the balance, gradually developed and strong to prevent lumbar muscle strain; 5, timely correction of excessive forward bending of the spine, to maintain a beautiful body shape.