Teenagers who are physically active in any way are less likely than their TV-watching peers to smoke， drink or take other health risks.
Kids who spend hours watching TV “miss opportunities” to socialize①， develop skills， learn teamwork and have other experiences that their more active peers benefit from. Active teenagers are more proud and have better scores； they are not easily to engage behaviors from drinking， smoking， drug use to other dangerous behavior. In general， no matter taking part in what kind of activity， teenagers who are physically active are healthier than those TV-watching peers②.
Not only should parents encourage their kids to engage in the physical activities they enjoy， but schools and communities should also do more to create opportunities for children to be active.
Parents play an important role in their children’s activities， if they do not play with their children， it will bring negative influence on children. Teenagers who played sports with their parents were less likely than TV lovers to engage in any of the behaviors from drinking and drug use to delinquency③.
That doesn’t mean， however， that kids have to be on the football team. “Alternative” activities like skating and skateboarding—which adults sometimes frown upon—were also related to better self-esteem and less risk-taking.
That skaters were better behaved than TV watchers might come as a surprise to some adults who see these teens as a nuisance④.
Overall， exercise is not only about weight control， the most important is that exercise have many benefits.
① socializevt. 使适于社会生活； 使符合群体生活之需要 vi. 参与社交；交际
② peern. (地位，能力等)同等的人；同辈，同事
③ delinquencyn. 违法行为；少年犯罪；懈怠
④ nuisancen. 【律】妨害行为，骚扰行为；讨厌的人(或事物)；麻烦事
活泼好动利于青少年健康
那些经常到户外锻炼身体的青少年较之常常待在家里看电视的同龄人，前者染上吸烟、酗酒以及其它一些不良习惯的可能性要明显小于后者。
那些长时间看电视的孩子们一般没有多少机会去参加各种社会活动，发展多种技巧，进行团队活动或者进行其他体验。活泼好动的青少年通常拥有更强的自豪感，更为优异的学业成绩，同时也更不容易出现诸如吸毒、吸烟、酗酒以及其他危险行为。总的来说，无论具体参加的是哪一项运动，那些爱玩的孩子们的健康状况的确要好于总是坐在电视机前的同伴。
不仅父母们应当鼓励自己的孩子积极投身于其所喜爱的各项运动之中，而且学校和社区也应该努力为孩子们创造更多的活动机会。
父母在其子女的健身运动中所充当的角色很重要，如果父母不陪孩子玩可能会带来负面影响。那些与自己的父母一起参加运动的孩子们会比同年龄的“电视爱好者”更不容易沾染上从酗酒、吸毒到青少年犯罪在内的一系列不良行为。
当然，这也并不意味着孩子们必须在课余时间加入到某支足球队中。诸如滑冰或滑板等有时会令成年人皱眉头的“另类”运动同样可以带给孩子们更多的自豪感与更低的染上坏习惯的可能性。
滑冰比看电视更有利于青少年健康成长这一结论可能会让某些成年人大吃一惊，因为他们总是将喜爱轮滑的孩子们视做调皮捣蛋者。
总的来说，锻炼不仅仅是为了控制体重，更重要的是锻炼有许多好处。