Dana Wilkes was making $340,000 a year at a Manhattan firm when she quit, got her NSCA certification, and moved to Denver to train people for a living. Her colleagues thought she'd lost her mind. (Her salary dropped by about $280,000 the first year, so technically they had a point.) Four years later, she has a fully booked private training practice, a digital program with 40,000 paying subscribers, and a lifestyle that would make her old boss cry into his bonus check. Her "Executive Edge" program — designed for high-performers who have 30 minutes and no patience — has been called the only fitness program that actually fits inside a real person's life. Dana will tell you the hardest thing she ever trained was her own patience. Everything else, she figured out pretty fast.