Make it a habit to ask your child how he is feeling throughout the week, and if your energy levels start to fall or is he showing a decreased performance in sports that normally play, this is a good sign that the program weight can be a bit too much for him, and you should reduce the frequency of sessions, or on the volume of each session he performs.
Teach him proper nutrition
Along with its training program, you will also want to spend some time to overcome a proper nutrition with your child. Now is the time to make you eat frequently throughout the day with balanced meals and snacks consist of a solid source of protein and slow digesting carbohydrate forms.

Many childs are still picky about their food choices, then wrap it in the process, taking groceries so he can choose which items he will like that are healthy. Encourage your child to avoid dependency on ready-to-go snacks convenience, since they will only fill your body with empty calories that will not support the regular training.

Good snack options include nuts, dried fruit, beef jerky, boiled eggs, breads, granola, yogurt cups or low-sugar. Try to take it away from supplements like creatine and protein powder at this point so he can concentrate on sound eating habits first. Protein powder, and possibly creatine may be safe additions to your child's diet on track, but only when he is eating well first.
It gives you realistic expectations
The last step in helping your childager with your first workout is to provide you with realistic expectations. Ask your child what your goals are and make sure that what he wants is to practice. In recent years child is possible for him to grow muscle mass very quickly because of all the changes happening with your hormones, but make sure he does not expect to build huge muscles overnight. The target of 1 to 1.5 kg of weight gain every 10 days would be a good approximation of what is realistic. For younger adolescents (15-16 years), 1 or 2 pounds per month would be a better estimate.
healthy behaviors from the beginning
As your child gets home from school asking about going to the gym, go with him for the first month to help him on the track. It's a great sign that he is already showing interest in being active, so make sure that encourage healthy behavior and be a positive role model.