Jeff Savage 
Deadly Hard-Hitting Sports 

Would you enjoy letting yourself fall from the top of a skyscraper? Or swimming through a narrow, dark passage in an underground cave, thousands of feet from the surface? Some people do these things for fun every day. Are they more fearless than most people, or just plain crazy? Take the plunge with some daring athletes and see if you have the stomach for the world’s deadliest sports.