"@kenenisabekele is considered one of the greatest distance runners in history. And yet even the 3-time Olympic champion isn't sure that a human can finish marathon in less than 2 hours. "I can't say it's possible," @kenenisabekele said. "For me it's impossible, maybe. You never know. Maybe in 10 years' time there is a different thing. Maybe somebody creates a new technology." That's where physiologist Yannis Pitsiladis comes in. His Sub2 Project, as it's called, is an attempt at the extraordinary — a quest to propel a marathoner past the 2-hour barrier. Along the way, Yannis hopes to understand the limits of human performance. "What can man do?" he asks. @urielsinai took this photo of @kenenisabekele picking flowers after a high-altitude training session in Entoto, Ethiopia. Visit the link in our profile to read the full story, in 2 parts, from @nytimessports. #nytweekender" By nytimes on Instagram.
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