Fitness and Adventure: What it will take to run a sub-two-hour marathon

Fitness and Adventure on SI.com

What it will take to run a sub-two-hour marathon

In 1991, Michael Joyner published the first scientific paper on how fast a person could run a marathon. 25 years ago he wrote 1:57:58 was possible and explains how and why he\'s sticking with that prediction.

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