As your child in his mid-teens, there's a good chance he will be interested in a program of weight lifting, especially if he is actively involved in sports that require brute strength and muscle mass to perform well.

Getting your teen about the right kind of exercise program for your body type and size is important for you to give him the right to be getting in the gym next year. Misdirected teenagers often go to the gym to do what they think they should be doing, only to end up with an injury in the process. For being there to guide you, help you put it on the right foot of appropriate training and exercise routines.

See how to get the teenager started working out.
Start with little or no weight
When your teenager is just starting in the gym is important for your body to learn the patterns of movement in the first place, since there will be a series of muscularity adaptations that occur. If you start using heavy weight, you will find that it is starting to fail with the movement and your body can become overly stressed.

Using body weight exercises to start or run basic exercises using weight machines with 10 to 20 pounds of resistance is the best idea at this point.
Practice good form
After teaching the correct technique for teen, keep practicing this form at least two weeks before progressing further with heavier weights or more complex movements. He can ask to start charging heavyweights since there is a good chance that he could comfortably do it, but you do not want to risk sacrificing his form. average weight is important for muscle development, but the proper way is even more important in the long term.

By waiting two weeks, while it really gets used to the patterns of motion, you will prevent injuries from happening and make fitness a habit continued.
Add weight and control their ability to recover
After two weeks of practice form are slowly starting to add more weight in 5 - to 10-pound increments. Ideally, you should keep it working on the protocol of the High Representative, somewhere between 10 and 15 repetitions, which ultimately means less weight than he thinks he can handle. At that point, he should avoid focusing too much on the development of maximum strength as his body is still growing during the early years of puberty.

When he reaches the age of 17 or 18, he may begin heavy lifting, pushing his body to the max.