Fit kids 'get better grades in class'

School students in the best physical shape outscore their classmates on standardized tests and take home better report cards, a new study has found.

It's the first study linking children's fitness to both improved scores on objective tests and better grades, which rely on subjective decisions by teachers.

The study by Michigan State University is also among the first to examine how academic performance relates to all aspects of physical fitness – including body fat, muscular strength, flexibility and endurance – according to lead researcher Dawn Coe.

"We looked at the full range of what's called health-related fitness," Coe, who conducted the research as a doctoral student in MSU's kinesiology department and is now an assistant professor at the University of Tennessee, Knoxville, said.

"Kids aren't really fit if they're doing well in just one of those categories," she said.

Coe and colleagues gathered their data from 312 students in sixth through eighth grade at a West Michigan school. They gauged the kids' fitness with an established program of push-ups, shuttle runs and other exercises.

Then they compared those scores to students' letter grades throughout the school year in four core classes and their performance on a standardized test.

The results showed the fittest children got the highest test scores and the best grades, regardless of gender or whether they'd yet gone through puberty.

The findings suggest schools that cut physical education and recess to focus on core subjects may undermine students' success on the standardized tests that affect school funding and prestige, co-author James Pivarnik, who advised Coe on the project, said.

The study is published in the Journal of Sports Medicine and Physical Fitness.

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