As kids head back to school, attention is usually on the academics: teachers planning the first lessons, and parents making sure students haven’t lost too much ground over the summer. But a new study draws attention to an often overlooked part of the school day: recess. It turns out that little break after lunch – on average – is responsible for a quarter of kids’ daytime physical activity. But not all students are taking advantage of the opportunity. And, it turns out, two things that can boost