This high-energy book takes a thorough look at the dynamic science behind skateboards, snowboards, scooters, and inline skates. Keltie Thomas, author of the "How Sports Work" series, gives active young minds a complete rundown of four of today's most popular extreme sports. She uses lively language and illustrations to demystify the science behind these sports. Readers discover how the pros appear to defy gravity in radical aerial stunts, how to maintain their equipment, how to have fun safely, and more. With color photos ...