Matt Fitzgerald has authored or coauthored 17 books on topics related to running, triathlon, fitness, and nutrition, including The Runner’s Body and Brain Training for Runners. He has written for Bicycling, Men’s Fitness, Men’s Health, Men’s Journal, Outside, Runner’s World, Shape, and Women’s Running, among other major national publications and his byline appears regularly in Competitor, Inside Triathlon, and Triathlete and on competitor.com, triathlete.com, and active.com (where he is a featured running and triathlon expert). A certified sports nutritionist, he has served as a consultant to a number of sports nutrition companies, including Energy First, Next Proteins, and PacificHealth Labs. As a coach, he designs running and triathlon training plans that are sold through trainingpeaks.com and consults for PEAR Sports—maker of a new training device for runners—as a training intelligence specialist. Fitzgerald continues to run competitively.