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 running stock footage at AdventureImagery.com/running.
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