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ROSS TUCKER, PHD, serves as scientific editor of Runner's World South Africa, a consultant technical expert with Adidas South Africa, and editor of Health 24, South Africa's largest fitness- and health-related Web site. Tucker, a competitive runner himself, lives in Cape Town, South Africa.
JONATHAN DUGAS, PHD, holds a post-doctoral fellowship with the University of Chicago. He is the cocreator, with his colleague Ross Tucker, of the popular Science of Sport blog. A qualified USA Cycling coach, he lives in Chicago.
MATT FITZGERALD is a prolific health and fitness journalist. He writes regularly for such national publications as Men's Fitness, Men's Health, Runner's World, and Triathlete. With nine books to his credit, he also creates interactive training programs for runners and triathletes and leads clinics at triathlon and running events throughout the U.S. He lives in Northern California.