My opinion is he should not engage heavy lifting until about age 18 or later due to incompletely developed skeletal system. The bones are growing and not fully formed yet and not as strong. But it's a wonderful thing to get him accustomed to being in the gym and getting familiar with all the equipment and bonding with dad etc. It would be OK for him to lift moderate weights and do reps in the 15-20 range. Also it would be good for him to work on flexibility/speed, endurance, stretching, isometrics and cross training programs that work both aerobic and anarobic pathways (e.g. HIIT/sprints). Any body weight exercise is OK - i.e. pullups, pushups.



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This typically occurs at around age 14 in girls and age 16 in boys. However, he notes that people of any age can benefit from calisthenics in which the body works against its own weight, such as in sit ups, leg lifts and push ups. He also agrees with the following weight lifting guidelines for children provided by the NSCA and the American Council on Exercise:
