This brief explores how the growth of school-day testing has changed the overall population of annual ACT testers to be more representative of all students; it also highlights key insights from school-day testing programs nationwide.

Ample evidence documents rising student obesity in summer months and falling student obesity during the school year. One theory for this pattern is that out-of-school days lack some of the structure and health-promoting behaviors that schools provide. Given this observed seasonal pattern, a natural question is whether there is room for policies…