Sep 21, 2016 7:00 AM

Gallery: What Gives With So Many Hard Scientists Being Hard-Core Endurance Runners?

Barkley Movie LLC
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Ultrarunner Jared Campbell clings to a tree while scaling “Danger Dave’s Climbing Wall,” one of the many challenging ascents faced during the course of the 2012 Barkley Marathons.
Barkley Movie LLC
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Lazarus Lake, CoFounder of The Barkley Marathons, hangs one of the required entry items, a license plate from the runner's home state or country. Other requirements include a flannel shirt and the application fee of $1.60.

Barkley Movie LLC
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Gary Cantrell
Barkley Movie LLC
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Barkley “Virgin” John Fegyveresi runs past the decommissioned Brushy Mountain State Prison during the 2012 Barkley Marathons. A historic prison escape was the inspiration for The Barkley Marathons.

Barkley Movie LLC
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Brett Maune
Barkley Movie LLC
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In Frozen Head State Park, TN, runners from around the world line up before the Barkley Marathons CoFounder, Lazarus Lake. The trail race is 130 miles, 120,000' of elevation change, all in under 60 hours.

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