Very often people "get hooked" on sports exactly at the age of 13-16. In addition to the natural need for activity, there is a desire to look more attractive. It is great if there is a like-minded person who shares an interest in training. Many bodybuilders started that way: training in the gym with a friend after school. Such a tandem is very important for teenagers: it is both support and common interests. Often children of this age prefer to spend all their free time in the gym, and this is not the worst option to organize leisure time.
Sports - this, of course, is health. In such a difficult period of human development is very important to support the posture, to saturate the tissues of the body with oxygen through physical activity, to maintain at the proper level of metabolism.
Among other things, just at this age through sports such qualities as willpower, determination, perseverance, desire for development, the ability to concentrate, the ability to take unconventional decisions will be finally fixed.