Roller derby is an extreme sport making a comeback! With a history that dates back to the 1930s, in the last decade, roller derby teams have grown in number and popularity. Readers take a turn around the track and discover that, from hard hits to fast breaks, the action in roller derby is nonstop. Full-color photographs highlight the mostly female teams who dominate the sport and the theatrical quality of each jam, or matchup. Safety tips offer help...