If the lower back action is not standardized or not back in time after the lower back, can lead to lumbar muscle, ligament strains and lumbar muscle strain. The human body movement is a limit, if excessive bending, more than the body’s limit is easy to be injured. Therefore, when practicing lower back, be sure to do a good job of warming up, so that the muscles, joints and ligaments are completely relaxed before lower back, and gradually, gradually increase the bending degree, timely return to the waist, practice under the protection of the teacher, in order to reduce the damage to the body when lower back.