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|A lack of prize money and endorsements doesn't deter hearty souls such as Scott |
Jurek from ultrarunning.
|Punishing temperatures and elevation gain make Badwater the best-known ultramarathon event.|
|Great Britain's James Zarei won the Spartathlon in 1995, and believe it or not, he didn't |
grow this beard en route.
|Yiannis Kouros owns many ultrarunning records, including |
the fastest times for 100- and 1,000-mile road races.
|Dean Karnazes won an ESPY award for running 50 marathons in 50 days in 50 states. But that doesn't mean he's considered the best in ultrarunning circles.|