In this Friday, Oct. 26, 2012 photo, Billy Hirschfield, 16, works out on a stair stepper machine at NX Level, an elite training facility in Waukesha, Wis. Owner Brad Arnett knows there are those who question whether kids should train in his facility. But he makes it clear that they have to want to be there, as Billy did. "We want your kids to want to do this," Arnett says. "We don't bring them in and work them until they puke. There is a means to an end."