There’s another burst of seat-bouncing, giggling and shouting in researcher Rebecca Hasson’s simulated classroom at the University of Michigan as Hasson catches study participant Marcus Patton cheating at Sorry! Marcus isn’t having it. “How do you call that cheating?” demands Patton, an 11-year-old cyclone of energy. Patton admits it’s tough to sit still. Like millions of other U.S. middle and grade school kids he gets scant exercise during school because budget and time restraints have…