A, nest in the sofa The soft texture of the sofa will allow people’s hips to sink, the body nest up, feeling very comfortable, but because the position of the knee is higher than the waist, the back arched, the waist muscles will be stretched, so the burden will be great, long sitting waist muscle fatigue easily, causing back pain. Chair or a little harder good, especially the waist is not good for people, more should not sit on a loose sofa or bed. Second, the chair is only half sitting Some people are accustomed to sitting with the hips only with the chair to take a side, back recline back, waist hanging, and even two legs before stretching open, in fact, this seems to be very comfortable comfortable sitting on the waist damage. This is because, this sitting posture so that the spine arched, the waist lost the support of the back of the chair, the pressure will be very large, easy to cause low back pain. It is recommended that when sitting, to ensure that the hips are in the chair, the whole back to the back of the chair. 3, cross-legged sitting Many people sit when they like to cross-legged, or one foot resting on the other leg. But over time, it will cause muscle imbalance between the left and right sides of the legs, which in turn affects the lumbar muscles. It is recommended that when sitting, legs flat on the ground, thighs parallel to the ground, if the chair is too high, you can pad a small bench at the feet. 4, the body leaning forward Some people are used to leaning forward when sitting in order to see the computer screen, will also hurt the waist. Many people also have the habit of leaning forward when driving, in fact, in the case of tying the seat belt, so sit waist by the tension is very large. The correct sitting posture is the waist against the back of the seat, straighten the back.