Bre'oun Dance looks elastic. He moves from the ground to the air, dancing in between, in a matter of seconds. He stiffens his chest, pops it in and out, jerks it back. His arms swing like windmills.
CHESAPEAKE, Va. — On a peaceful afternoon in a suburban home garage, Demetrus Leslie, 17, jerked like he was dosed with strychnine. His arms lashed menacingly, then he dropped to the floor, only to ...