Directs all public schools to provide to students, in each of grades kindergarten through twelve, opportunities for at least forty minutes of physical activity each school day, except that where there are fewer than three instructional hours in a school day, schools must provide opportunities for at least thirty minutes of physical activity each school day. Such opportunities may include recess, a physical education class, or other school activities, but must in all instances allow students to be physically active. Opportunities to participate in school athletic programs, where the activity occurs before or after instructional hours, do not satisfy this requirement.