Runner's World Online About this site: Whether you're a couch potato or a seasoned marathoner, you'll find something here to make your running workout easier--or more challenging. More than just a warmed-over version of the monthly magazine, Runner's World Online is the ultimate site for runners of all ages, experience levels, and agendas. (http://www.runnersworld.com)   Pluses: Sections on nutrition, injuries, and training. Forums allow registered visitors to swap advice and war stories.   Minuses: Spare site design makes it hard to tell one page from another.   Best feature: Beginner's section at (http://www.newrunner.com) provides valuable data on how to get started. Includes a training log and inspiring articles.

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