Especially in tough economic times, running offers an affordable and positive way to relieve stress and gain a sense of accomplishment. Marathons and - more than ever - half-marathons are the ultimate achievement for runners and have experienced an unprecedented boom in the last several years. New hunger for reliable information on marathon and half-marathon training, as well as new technologies that have revolutionized ordinary people's ability to train intelligently, means the time is right for a new edition of longtime "Runner's World" contributor Hal Higdon's classic guide to taking the guesswork out of preparing for a marathon, whether it is a reader's first or fiftieth. Since its original publication in 1993, Higdon's definitive manual has sold over a quarter of a million copies through all channels. The book is such a consistent seller for many reasons, but above and beyond all the others is this one: It works. At the core of the book remains Higdon's clear and essential information on training, injury prevention, and nutrition. With more than 25 per cent new material, this fourth edition of a running classic will be a must-own for both longtime runners and those new to the sport.