SARAH LORGE BUTLER is a Runner”s World contributing editor who has covered the racing, training, and nutrition habits of runners of all abilities, from beginners to Olympians.BUDD COATES, ms, has a degree in exercise physiology and is a member of the Runner”s World advisory board.RUNNER”S WORLD is the worldwide authority on running information. With a goal to inform, advise, and motivate runners of all ages and abilities, Runner”s World aims to help runners achieve their personal health, fitness, and performance goals, and to inspire them with vivid, memorable storytelling.