Many patients with thoracic deformity always have too many expectations of bodybuilding, thinking that the congenital “unfit” can be compensated by the acquired bodybuilding. This mood is good, but the result is often not perfect. This has a lot to do with the structure of the thorax. Thorax actually refers to the bony structure of the chest. Once the bony structure is set, it is very difficult to improve by the patient’s own strength. Especially when the patient reaches puberty, it is more difficult to change the shape of the ossified bones. Bodybuilding or the so-called exercise can generally only change the shape of the muscles, which can cause the volume and size of the muscles to change, but such a change cannot cause a change in the shape of the bones, so it is difficult to imagine that the deformity of the chest will be improved by a change in the shape of the muscles. In clinical practice, it is true that some patients have improved the appearance of the thorax after exercise, but this is not a change in the structure of the thorax, but a hypertrophy of the muscles that happens to fill in the depressions of the thorax or conceal the obvious defects. This is actually a self-deception, because the patient’s exercise only changes the appearance, but the deep thorax does not change its shape because of exercise. Another situation that is often encountered in the clinic is that of fattening. The starting point of this practice is the same as bodybuilding, also want to use the body surface fat “coat” to cover up the deformity. In addition to being as self-defeating as bodybuilding, this practice is even more foolish than bodybuilding because it increases the body’s fat and brings greater problems.