Matt Fitzgerald is an endurance sports writer, nutritionist, and author of more than twenty books. He is a coach and spokesperson for PEAR Sports and former senior editor at Triathlete and Competitor. Fitzgerald has contributed to Men's Health, Outside, Runner's World, Shape, and other publications. He lives in Northern California with his wife, Nataki. David Warden is an internationally recognized endurance coach and author. Owner of a successful independent triathlon coaching business, David is also a co-head coach of Team IronCowboy. His current and former clients include a duathlon age-group world champion, a Guinness world record holding triathlete, and multiple full and Ironman 70.3 World Championship qualifiers. David's personal athletic resume includes thirty-four triathlon and duathlon victories and the top American finisher at Ironman Mallorca 70.3. David lives with his wife and three children in Utah.