Exercise not only does a body good—it helps kids learn, too. Finnish researchers measured the physical activity and sedentary time of children at five different schools in one school district in Finland over a seven-day period. They tested a variety of cognitive functions, such as memory, attention, information processing and problem solving. Study results showed children performed better mentally when activity levels were higher. The New Jersey Department of Education requires all public school children in grades one through 12 to participate in 150 minutes of health, safety and physical education per week.