Dr. Kelly Starrett, coach and physiotherapist, is the author of the New York Times and Wall Street Journal bestseller Becoming a Supple Leopard, which has revolutionized how coaches, athletes, and everyday humans approach performance as it relates to movement, mechanics, and the actualization of human and athletic potential. He and his wife, Juliet Starrett, co-founded San Francisco CrossFit and MobilityWOD.com, where they share their innovative approach to movement, mechanics, and mobility with millions of athletes and coaches around the world. Kelly travels the world teaching his wildly popular CrossFit Movement & Mobility Course and also works with elite military forces and every branch of the military; athletes from the NFL, NBA, NHL, and MLB; and nationally ranked and world-ranked strength and power athletes. He consults with Olympic teams and universities and is a featured speaker at strength and conditioning and medical conferences nationwide. Kelly believes that all human beings should know how to move and be able to perform basic maintenance on themselves. He lives in northern California with his insanely talented and amazing wife, Juliet, and their two young lionesses, Georgia and Caroline. His chief life goal is to spend more time on the beach with his family.

T.J. Murphy, over the course of a 20-year career, has established himself as one of the endurance world's most prolific writers. He has served as editor-in-chief of both Triathlete and Inside Triathlon magazines and as editorial director of Competitor magazine. His endurance journalism has appeared in Outside and Runner's World. In 2012 he gave things a twist when he chronicled his personal odyssey into strength, conditioning, and mobility in the seminal work Inside the Box- How CrossFit Shredded the Rules, Stripped Down the Gym, and Rebuilt My Body.