Sitting posture is good for the waist is mainly to maintain a head-up posture. One, in the sitting position when trying to choose a higher seat, can not sit on a short bench, because sitting on a short bench will lead to the waist presents a flexion state, it will lead to increased pressure between the vertebrae, resulting in intervertebral discs are prone to degeneration as well as disc protrusion, and prone to lumbar muscle strain, muscle fatigue, tension, the formation of aseptic inflammatory lesions, resulting in lumbar pain feeling repeatedly, is not conducive to recovery. In the usual sitting stool try to choose a seat with a backrest, and knee flexion 90 degrees, thighs and the ground basically parallel, so as to effectively keep the lumbar muscles relaxed. Second, in the sitting position when the left side of the waist muscles and the right side of the muscles alternate weight-bearing, so that one side of the muscles in a relaxed state, tired and then replaced by the other side of the muscles, through the alternate way to avoid fatigue and strain on the lumbar muscles.