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Physical activity may help students do better in their classes. The research comes as educators in some countries are reducing time for activities like physical education. They are using the time instead for academic subjects like math and reading.
Researchers at VU University Medical Center in Amsterdam reviewed the results of fourteen studies. Twelve were from the United States, one from Canada and one from South Africa. The studies appeared between nineteen ninety- seven and two thousand and nine. They included more than fifty-five thousand children, aged six to eighteen.
Researcher Amika Singh says the studies showed a link between physical activity and scores on subjects such as math, English and reading, and concluded that being physically active is beneficial for academic performance.
Ms. Singh offers some possible explanations. There are, first, physiological explanations, like more blood flow, and so more oxygen to the brain. Being physically active means
A. They are facing budget deficit.
B. They are giving more weight to academic study.
C. They are conducting observational studies.
D. They are shortening school hours.

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