Water skiing (Bettmann/CORBIS)

Hang gliding (Hulton-Deutsch Collection/CORBIS)

Sail fishing (Bettmann/CORBIS)

Mountain biking (Karl Weatherly/CORBIS)

Surfing (Fran├žois Duhamel/Sygma/Corbis)

Motorcycling (Fox Photos/Getty Images)

Sky surfing (AP Photo/Horst Reckmann/Skymax)

F3 racing (Phipps/Sutton Images/Corbis)

Diving (AP Photo/Shizuo Kambayashi)