unbreakableperformance.com
What It's Like Working Out With Pop Stars, Actors and Athletes
A reporter hits up elite gym Unbreakable Performance Center, where Sylvester Stallone, Demi Lovato and Nick Jonas sweat and recover alongside pro athletes and DJs. In Los Angeles you'd be hard-pressed to find a gym or boutique fitness studio where a celebrity hasn't stopped in for a workout. But yo