"@kenenisabekele ran during an early-morning training session at high altitude in Entoto, Ethiopia. @kenenisabekele is an 11-time world cross-country champion, a 3-time Olympic gold medalist on the track, and the world-record holder at 5,000 and 10,000 meters. He and a fellow Ethiopian, Haile Gebrselassie, are widely considered the greatest distance runners in history. Now, the physiologist Yannis Pitsiladis is trying to identify promising talent for an audacious plan: to use science to facilitate a sub-2-hour marathon by 2019, a decade or two sooner than many experts think. Yannis enlisted @kenenisabekele for his project. Through training and tests, he hopes to better understand what it might take for a runner — not necessarily @kenenisabekele — to make it. Visit the link in our profile to read about the scientist's quixotic quest. The photographer @urielsinai took this photo last September. #nytweekender" By nytimes on Instagram.
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