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 to new skaters, as this sport can get aggressive fast.