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The Scientist Who Helped Eliud Kipchoge Break 2 Hours: Dr. Andy Jones on the Limits of Human Performance and Possibility

The woman who breaks four minutes in the mile has probably already been born.

That's the opening claim from Professor Andy Jones, the Exeter physiologist behind Nike's Breaking2 project, and he gives her ten to fifteen years. The problem right now, he explains, is a split field: some women have the aerobic engine and the critical speed but no anaerobic reserve, while others have the speed and no endurance. Faith Kipyegon came up short on the 800m side, and Jones believes a properly paced attempt would have landed her near 4:03—a time that would have left the stadium feeling cheated.

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