Many people, including a number of doctors, pay very little attention to the pelvis. How important is the pelvis in the body? The pelvis is like the foundation; if your foundation is crooked, the entire spine will be crooked. Any tilt or rotation of the pelvis will have a significant, long-term effect on the shape and structural mechanics of the entire spine. What should the correct, normal pelvic shape look like? In a normal pelvic shape, the sacroiliac joint is at the back of the femoral head, and between the sacroiliac joint and the femoral head, there is a horizontal anterior-posterior distance, which means that the sacroiliac joint that supports the sacrum and even the entire spine is at the back of the femoral head, that is to say, the sacral bone and the lower part of the spinal column are empty, and the femoral head of the pelvis and the torso is in the front, so that the sacral bone has a tendency to fall downward, and thus, under this condition, the maintenance of a normal pelvic shape will have great, long-term effects on the shape and structural mechanics of the entire spine. Maintaining a normal pelvic shape under these circumstances can be challenging. Having the spine and sacrum behind the femur has advantages and weaknesses. The advantage is that it avoids direct impact from the body on the femoral head; the disadvantage is that it is very hard to bear weight, so it needs strong muscles and ligaments to ensure its stability, which is why our gluteal muscles are the thickest and most developed in the whole body. Many people tend to put their posture into such a state when they are load bearing: put the sacrum up, close the stomach and hold something. Why does he do this? It is that he instinctively let the spine, sacroiliac joints try to move to the femur right above to reduce the force of the sacrum falling. Nowadays, many people, especially young ladies, all hope that they have a “buttocks”, like Hollywood actresses, the higher the higher the more charming. In fact, high buttocks should be the result of thick and well-developed muscles, rather than meat is not thick, the sacrum up. The haphazard pursuit of fashion evolved into a torture, and even a disease, if the sacrum is too high, it is easy to form the lumbar vertebrae overcurved physiological curvature, the more need for strong, developed buttock muscles, but blind weight loss has caused the muscle weakness, the formation of the normal physiological structure, biomechanics, the reasonable demand for the exact opposite result. So this kind of lady is very easy to appear back pain, leg pain, stand a long time back pain, sit for a long time leg pain, computer with a lot of back pain, age a little bit after the collapse of the waist, hunchback, probe, leg bends, a look of old age. Therefore, the “buttocks” to rely on exercise, not by the “sacral”, holding such a wrong point of view, there will be endless consequences.