Completing a marathon is a worthy item for the bucket list. Twenty-six miles is a long way to run, but for the growing number of ultra-runners, that's just a quick, post-work jaunt. They power through exercise-induced hallucinations, organ failure and some of the most remote wilderness in the Lower 48.
Learn about adventure sports and see more wild footage at Fringe Elements central on NG Adventure: ngadventure.com/fringe
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Running: Ever Last | National Geographic
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