As childhood obesity continues to rise and physical education classes are replaced by academics, elementary schools are searching for ways to incorporate the federally mandated half-hour of physical activity into the school day. In-class exercise tends to put off many teachers who believe that the burst of activity in the classroom will disrupt learning. But new research suggests that mini exercise breaks during the school day may actually work quite well. In a series of five studies, researchers at the University of Michigan (U-M) confirmed that 2-minute bursts of in-class exercise not only increased the amount of daily exercise for students, but did so without hurting math performance. In fact, when the exercise breaks were incorporated into classrooms throughout southeast Michigan, teachers found the breaks quite doable, and in some cases, could even enhance learning. "Teachers were worried it would make kids more rowdy, but 99 percent of kids were back on task within 30 seconds of