According to a team from the Harvard Family Research Project, school recess is the perfect time to instill long-term fitness values among kids. It’s better than PE (physical education) classes, since it’s offered every day. However, according to the team, grown-ups should be more involved in supervising fun yet active recess activities for children. In fact, kids are thought to perform better at school when they get to burn off energy through physical activity. The team studied the effects of a nonprofit program, Sports4Kids, for a year at a Boston elementary school. The program trained adults to develop fun, healthy recess activities for children and also to help the kids resolve conflicts without fighting. The result? Kids became more cooperative, felt safer on the playground, and enjoyed healthy physical activities during recess.