The Internet democratizes everything: music, news, encyclopedias, and now—the best yet if you're an athlete—fitness. The Web has put the country's top personal trainers within reach. Want to ride like Lance Armstrong? His coach will talk you through a spinning session. Want to blitz a triathlon? Let Paul Huddle, coach of former Ironman champions, be your guide. This unprecedented access to expert trainers, plus other high-tech offerings—like an online data cruncher used by the pros, downloadable workouts for your digital audio player, and a heart-pumping video game (really)—make getting in shape what it should be in the 21st century: fast, cheap, and fun.