Founder of RE Fitness Ryan Engel is an international fitness coach and creator of the best-selling fitness series Advanced Abs ©, and The Female Fat Loss Handbook ©. Ryan is an authority and thought leader for no-nonsense, easy-to-understand fitness knowledge. Ryan's philosophy of using high intensity interval training paired with effective nutrition systems, such as carb cycling, has quickly taken flight as a fail-safe way to shed unwanted body fat.