Dean Karnazes is a world-renowned ultramarathon runner famous for completing 50 marathons in all 50 U.S. states over 50 consecutive days in 2006—a feat captured in his bestselling memoir and documentary. He also ran 350 miles nonstop in over 80 hours without sleep, won the grueling 135-mile Badwater Ultramarathon through Death Valley, and completed a marathon at the South Pole in -40° temperatures.
During extreme long-distance efforts, Karnazes experiences a semi-conscious "running sleep" where his body continues moving without his muscles hitting typical exhaustion or shutting down. His rare physiological endurance allows him to flush lactic acid efficiently, keeping him moving when normal bodies break down.
Named one of TIME's 100 Most Influential People, Karnazes continues to log extreme mileage in his 60s, redefining the limits of human physical endurance.
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