State law recommends recess.
Indiana Code 20-30-5-7.5 Physical activities
(b) Beginning in the 2006-2007 school year, the governing body of each school corporation shall provide daily physical activity for students in elementary school. The physical activity may include the use of recess. On a day when there is inclement weather or unplanned circumstances have shortened the school day, the school corporation may provide physical activity alternatives or elect not to provide physical activity.
Indiana Model School Welness Policy on Physical Activity and Nutrition
Model school wellness policy