Though the P.E. class is a part of children's education, many teenagers don't form the habit of doing exercise. As a result, they don't have interest in sports. Enthusiasm (热情) for sports is of great importance. Young people should treat it as their part of education.
On the one hand, as for school, increasing teenagers' enthusiasm for sports is a good way to help teenagers keep a healthy lifestyle. In the school, students are forced (强迫) to take exercise in the P.E. class by teachers. They need to join in certain activities. In this way, students live in a healthy lifestyle, and they won't get sick easily. But after they leave school, no one forces them to do so, so they are lazy to take exercise. As a result, their bodies get weaker.
On the other hand, the enthusiasm for sports is helpful for students to increase their sense of team work. As we all know, most sports need more than one person to do, like badminton and ping-pong. These sports need more than two people. When students are playing badminton, they need to cooperate (合作) so that they can defeat others. If they just keep an eye on themselves, the game can't be played well. Doing these sports will bring students the sense of teamwork, which is important for their career.
Teenagers should keep the habit of taking exercise. If they have enthusiasm for sports, taking exercise will be a kind of happiness to them.