Game On: Extreme Sports Quiz

The word "BASE" stands for Buildings Antennae Spans Earth.

Zorbing is a crazy ride inside a plastic ball that travels down a grassy -- or even snowy -- slope.

The $350 Flybar 1200 can bounce 5 feet (1.5 meters) in the air.

Olympic white-water canoe racing, or slalom canoeing, became an Olympic sport in the 1970s.

A speedball is a double front roll; a whirlybird is a back roll with a 360-degree spin.

Wingsuit fliers must use parachutes to land, but they utilize the physics of flying to maximize their flight time on their journey from airplane to ground.

Acting as his own press agent, ticket salesman, promoter and emcee, Knievel's first professional jump was 20 feet (6 meters) over boxes of rattlesnakes and two mountain lions.

When parkour hit the English-speaking world, it was given another name: free-running. Traceurs are parkour athletes.

A typical biathlon event requires participants to ski for a certain distance, usually between 3 and 5 kilometers (between 1.9 and 3.1 miles), with .22-caliber rifles strapped to their backs.

If you ride with your right foot forward, you are goofy footed. If you ride with your left foot forward, you're regular footed.