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I think sports should be compulsory at school because they help us to keep fit and healthy.
Sports are good for everybody. Besides, they make people happier, that is to say, they become healthier and happier, when a person, for example, has studied hard, its very good to do some sport because it relaxes you before an exam, before a difficult situation, and so on.
As for health, they only have good points: they help the blood system to work better, the muscles get better, too, etc.
Finally, everybodys health and body become better after practising some sport, so, in my opinion, they should be practised at school.