Also, students involved in organized sports learn rules and how to follow them. This could improve their classroom behavior and help them keep their mind on their work.

　　The study leaves some questions unanswered, however.Ms.Singh says it is not possible to say whether the amount or kind of activity affected the level of academic improvement.This is because of differences among the studies.

　　Also，they were mostly observational studies. An observational study is where researchers do not do controlled comparisons.They only describe what they observe.So they might observe a link that students who are more active often have better grades.But that does not necessarily mean being active is the cause of those higher grades.

　　Still, the general finding was that physically active kids are more likely to do better in school.Ms.Singh says schools should consider that finding before they cut physical education programs.

　　1．What did the research conclude about the relationship between physical activity and academic performance？(No more than 10 words)

　　________________________________________________________________________

　　2．What’s the function of endorphins？(No more than 10 words)

　　________________________________________________________________________

　　3．What are the benefits of learning organized sports rules and how to follow them for students？(No more than 15 words)

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