Adolescence is the fastest stage of bone growth and development. At this time, bones are most sensitive to exercise. On the premise of adequate nutrition (especially calcium and protein), active exercise can significantly improve bone density, which will undoubtedly get twice the result with half the effort in promoting bone health. As we mentioned earlier, exercising strong bones in the growth and development stage will greatly reduce the risk of osteoporosis and fracture in old age compared with other people. Therefore, the prevention of osteoporosis should also start with dolls. Teenagers are lively and active by nature, and often regard exercise as play and fun. From the point of view of health, it should be strongly advocated and encouraged. We must prevent teenagers from becoming bookworms who only bury themselves in their studies all day, or couch potatoes or mouse potatoes who sit in front of TV all day. This not only makes people lonely and obese, but also misses the golden opportunity to promote bone health and prevent osteoporosis at an early stage.