kids spend more time at their desks than ever. Preschoolers in the United States average just 48 minutes of exercise a day in their schools, even though the recommended level is 2 hours, according to a 2015 paper published in Pediatrics. Of that 48 minutes, only 33 minutes is outside. A 2009 study in Pediatrics found that 30 percent of third-graders get fewer than 15 minutes of recess a day, and another study found that 39 percent of African-American students had no recess compared to 15 percent of white students.
