Stretch a skateboard to three times its length and lay down on it. Now you have a street luge board. Take a skateboard and give it big rubber wheels. Now you have a dirtboard. These hybrid boards are the oddball cousins of skateboards, and Murdico explains the ins and outs of each sport. Readers will learn how lugers are able to take turns at 50 miles per hour, or how dirtboarders "bomb" down a hillside. Included are safety tips and profiles of the hottest skaters on today's pro circuits.