Book excerpt: For anyone, riding a bike can be a great way to get some exercise and fresh air. But some riders want a thrilling, pulse-pumping ride, whether it's through the woods and over the rocks on a mountain bike or navigating track-based obstacles in bicycle motocross, or BMX. This book captures the excitement and rush of extreme biking, from its California origins to today's X Games and Olympics. Readers will explore some of the biggest names in extreme biking and learn about exciting and challenging races. They will also learn about the bikes, gear, styles, stunts, and lingo associated with this speedy sport.