A study published in the journal Clinical Psychological Science finds that exercise has positive effects that go far beyond physical changes in teens, as it does with people of all ages.

The study, based on a survey of 7,000 Dutch students, found that teens who participated in team sports had higher self-esteem and a more positive self-image than those who didn't. Additionally, these students were less likely to engage in negative behaviors, including "social withdrawal and anxiety, getting into trouble, aggressive behavior with others," according to Alan Kazdin, the editor of Clinical Psychological Science. Teens who participated in team sports were also found to have more friends.

Source: Examiner.com
http://www.examiner.com/article/study-shows-exercise-has-positive-effect-on-teens-self-esteem-mental-health