Running an extreme sport? It is when your are running ultra-marathons...

Running an extreme sport? It is when your are running ultra-marathons hundreds of miles without stopping.

Running is practiced for competition, personal fitness and is part of training for other sports. Runners compete and push themselves to run distances in the shortest amount time. Disciplines include track, cross country, trail running, relay racing, sprints, long distance, marathon, ultrarunning and jogging.

See more extreme sports videos at AdventureImagery.com, a footage library specializing in adventure and extreme sports stock footage licensed royalty free for use in your own productions.

Added: September 20, 2007
Producer: AdventureImagery.com
Copyright: Adventure Imagery
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