Check out this article from Shots - Health News From NPR:
By Nancy Shute
October 22, 2013
"Girls who were more physically active at age 11 did better at school as teenagers, a study finds. And the most active girls really aced science.
It's become pretty much a given that children do better academically when they get regular exercise, even though schools continue to cut or even eliminate recess time. But there's surprisingly little hard evidence to back that up." Read More