10 ~ 13 years old is the female sexual maturity and the fastest development period. Attention should be paid to improving fast strength, especially the jumping ability of lower limbs, and increasing strength endurance, but the maximum strength is not greatly affected by development. From 13 years old to 15 years old, that is, male sexual maturity, the maximum strength growth is greater than the strength endurance growth, and the maximum strength and strength endurance can be developed. There are obvious differences in strength between men and women, but it is not appropriate to do excessive hard pull and squat exercise. Because ossification is still developing, a little carelessness will easily lead to sacral fracture, ruin sports life and affect the health of teenagers ... For those female athletes and teenagers who will not engage in other strength or fast strength events in weightlifting in the future, it is not appropriate to engage in more special strength training before 15 years old. At this time, we should pay attention to developing fast strength, not just strength training. At this time, strength training should serve the overall physical training, strengthen the correct posture of large muscle groups through strength training, and gradually cultivate the ability of children's muscles to coordinate their efforts. This is beneficial to the growth and development of living things. When developing the strength of children and adolescents, we should also consider that bones, ligaments and tendons grow slowly during the growing period, and unilateral use of high load will bring negative effects. Because, in the growth period, the growth area of bones is slack, and the one-sided tension of muscles will cause bone displacement. For example, before and during sexual maturity, excessive training of triceps brachii will lead to the displacement of ulnar capitulum, and one-sided strength training will also make muscles lose elasticity, especially one-sided emphasis on weightlifting competition practice will even lead to abnormal development of spine and bones.