Lacey Stone Booty Camp - Los Angeles

The sheer spring green is electric.
“Cyclone Vapor” running jacket, $115,

Also in New York.

Super-positive firecracker Stone is poised to become the next Jillian Michaels. Her tough early-morning outdoor boot(y) camps in L.A. and New York City magically make sprints, push-ups and squats super-fun. $300 to $350 for eight weeks of classes,