[Source: US News and World Report/HealthDay]

When overweight, sedentary kids start to exercise regularly, their ability to think, to plan and even to do math improves, a new study suggests.

In addition, exercise was linked to increased activity in the parts of the brain associated with complex thinking and self-control, according to brain imaging scans analyzed by the researchers.

"This implies that chronic sedentary behavior is compromising children's ability and achievement," said lead researcher Catherine Davis, a clinical health psychologist at the Georgia Prevention Institute at Georgia Health Sciences University in Augusta.

"We know that exercise is good for you, but we didn't have very good evidence [before this] that it would help children do better in school," said Davis.

Although this study was done among overweight children, she believes that similar results would be seen in normal-weight kids.

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