Ages 6 to 12 years. Extreme mountain bikers take to the mountains to satisfy their need for speed and extreme heights. From racing downhill on the steepest mountain slopes to performing tricks on obstacles such as fallen logs, these athletes have found creative ways to involve nature in their sport like no other extreme athletes. This book provides all you need to know about: extreme mountain bikes and their maintenance; the history of this young sport; the styles of riding and their main competitions; the stars who defy gravity.