Jillian Michaels is a fitness expert and wellness coach with over 20 years experience, and is a New York Times bestselling author of numerous books including Master Your Metabolism, Unlimited: How to Build an Exceptional Life, and her most recent The 6 Keys: Unlock Your Genetic Potential for Ageless Strength, Health, and Beauty. Jillian's passion for fitness training originates from 17 years of martial arts practice in Muay Thai and Akarui-Do, in which she holds a black belt. Her first comprehensive 90-day weight loss system, Jillian Michaels Body Revolution, is available in retail stores across North America, and JILLIAN MICHAELS BODYSHRED, an intense group fitness class based on Jillian's highly-effective 3-2-1 interval system, is taught worldwide.