Playing football does good or harm to students?

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Some people think that playing football does good to students,while others think that it does harm to them. In my opinion, students can benefit a lot from playing football. As we know, students are very young and they, of course, must spend most of their time in wirking hard at their lessons. However, it does not mean they should stay inside the classrooms and do the assighments given by the terchers all the time. They should develop physically as well as mentally. All work and no play makes Jack a dull boy. They need time to get relaxed and refresh themselves after class. Moreover, sports activities, like playing football, can help them build up their bodies,prevent them from getting too fat and keep them healthy. They can learn how to work together with others and have the virtue of winning without pride and losing with grace in football games. All this will be of great help to them after they graduate from school in the future. Therefore,students should be encouraged to play football. Only one thing that should be paid much attention to is that only after finishing their homework can they play football in their spare time. What' your opinion?