The length of the body and the length of the legs are the result of developmental changes in the body, and the height of the body is determined by the length of the various bones in the body. The length of the legs depends on the length of the leg bones, including the femur and tibia. If the bone growth rate slows down due to disturbing factors during the period of human bone length development, the length of the legs cannot reach the normal length, thus creating a condition of long body and short legs. Therefore, it is necessary to ensure good skeletal development conditions during the critical period of human bone development. In addition, long legs and short legs are mainly congenital heredity. If both lower limbs are significantly shortened, there is a significant gap between the upper and lower body proportions of the coordinated body, and the balance performance of the whole body movement is poor, hereditary poliomyelitis needs to be considered. If there are no uncomfortable symptoms and good growth of both lower limbs, the stability of the bone structure of the lower limbs can be enhanced through usual stretching and jogging, and this method is applicable to children before the age of 14.