What is commonly referred to as softening of the bones is medically difficult to do and harmful to the body. Once the bones become soft, the support of the body will be affected and pathological fractures may occur, making it impossible to stand and walk. The hardness of the bones can maintain a normal life and can be a good protection for the organs, for example, the solidity of the ribs and sternum can be a good protection for the heart, lungs and other important organs. If you usually feel stiff in sports posture and inflexible in activities, it is not caused by hard bones, but by adhesions of muscles, stiffness of ligaments and tendons, etc. If you do not exercise activities regularly, it will cause disuse degeneration of muscles. In terms of treatment, it is recommended that patients do more stretching exercises for the whole body, such as yoga, aerobics or dance, to improve the stretching of the ligaments and flexibility of the muscles, to achieve the so-called “bone softening”.