If you’ve seen “Free Solo” you probably remember Honnold getting a brain scan and the doctors pointing out that he doesn’t seem to experience fear the same way most people do. And that may seem like the answer when questioning how someone can pull themselves up thousands of feet of vertical rock with no aids or protection. But there’s so much more to it than that. In this video, a climbing instructor breaks down what it took for Honnold to manage what will forever be the sharpest edge of human performance.

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