Running is one of the simplest ways to stay in shape, and when it comes to losing weight it's a lot more fun than dieting. This 8-page guide outlines the most effective ways to hit the pavement for maximum slim-down results. Designed by the experts at Runner's World, and based on the popular book Run Your Butt Off, this introductory plan will kick-start your weight loss efforts. Enter your email address to download the free PDF and receive a bonus 12-week training log to keep you on track. For more motivational features, check out the 12 Tools for a Better Body in 2012.