In a recent study, students were graded by their level of physical activity. The fittest group of students did 30% better on standardized testing than the least fit group. They also did better in a set of core classes.

Results from the study, which included 317 students in grades six through eight, showed that the fittest group of students scored almost 30 percent higher on standardized tests than the least fit group. And the least fit students had grades in four core classes that were 13 percent to 20 percent lower than all other kids, according to findings presented at a recent ACSM meeting.

Experts speculate that exercise may boost academic performance in various ways, including: burning off pent-up energy and allowing kids to pay attention better and focus on their work; boosting self-esteem and mood; and increasing blood flow to the brain, helping with memory and concentration.

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