The bladder meridian starts from the eye point, then along the collar to the back, along the two lateral lines of the back, all the way to the waist and buttocks, and then down to the outside of the big toe. In the back of the back the bladder meridian can be seen as a bulge of muscles, not a bulge of the bladder meridian. Everyone’s muscle state is different. When getting down with very strong muscles, you can see very strong vertical muscles on both sides of the spine, which is the clinical manifestation of a normal person with strong muscles and is a sign of health. Some people’s muscular system is not developed, lying down when the back is flat, whether it is flat or this bulge, it is the performance of the muscular system, there is no abnormal problem, not that the protrusion of the bladder meridian.