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People who enjoy board sports often have a need for speed. But many -- especially those who don't have access to hills or ramps -- don't know how to get it. A riverboarder named Kevin Veon started tackling these acceleration issues in 2004 by experimenting with a braided rubber cord, and that's how bungee boarding was born.

Bungee boarding is a wild new adventure sport. It goes like this: You take a tough, 20-foot-long elastic cord. Tie one end to a tree beside a river, attach the other end to a small surfboard, and wade in. If you hold the board underwater, flat against the current, the pressure of the water pushes you downstream. When the cord has stretched as far as it will go, mount the board and angle it upward (in the direction from which you came) so that the current pushes it to the surface. With the force of the current greatly diminished, the stretched cord pulls the board -- and you with it -- back upstream at around 30 miles per hour. That's bungee boarding in a nutshell.Read on to learn more about the physical forces that make this sport possible.

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