DAVID ZINCZENKO, the editor-in-chief of Men's Health magazine, is one of America's leading experts on health and fitness. He has been a guest on Good Morning America, the Today Show, CBS's The Early Show, CNN, and Primetime Live, and has written Op-Ed pieces for the New York Times, Los Angeles Times, and USA Today. He divides his time between Allentown, Pennsylvania and New York City. TED SPIKER, an assistant professor of journalism at the University of Florida, is a contributing editor to Men's Health. His work has appeared in Fortune; O, The Oprah Magazine; Instyle; Sports Illustrated Women; and Adventure Sports. He lives in Gainesville, Florida.