Could elementary schools in the United States follow Swanson’s example? Right now, few could. At many schools, the threats of lawsuits and parental protests are too great. The fear that this will take away from test prep is too high. That’s why this is a collective action problem: Students would be healthier, happier, and smarter overall, with lower rates of injury and anxiety, if schools could loosen the reins and let children play in a more natural way. But we can’t get there unless schools, parents, and governments can find a way to work together.

