Megan Cole spent eight years as a Marine Corps fitness instructor, moved to Scottsdale, and opened a private training studio that has a six-month waitlist and a strict no-complaints policy. Her clientele is almost entirely women over 40 who'd been told by their previous trainers to "take it easy." (She finds that phrase personally offensive.) Her "Build Your Base" program is 45 minutes, six movements, and will make you question every decision you've ever made about what your body is capable of. She's been featured in three national magazines, turned down two reality TV offers, and recently signed a deal to bring her program into corporate HR wellness initiatives. The only thing tougher than her workouts is her waiting room conversation.