Better Math, English, and Science Grades!

Research on British school children has found a link between academic performance and daily exercise. English, math, and science scores went up as the number of minutes per day of exercise increased with the greatest gains in female science scores. With boys and girls only exercising 18-29 minutes per day on average, how much could grades improve if physical education hours were increased instead of cut back to save money?
British Journal of Sports Medicine, October 2013