A colleague recommended "Free Solo" to me a few years back. There was this part where the doctors claim (paraphrasing) his brain is unique in that he is much less afraid of danger than us. The part towards the end, where he does the actual climb of El Capitan in Yosemite National Park, is also worth watching.
Amazing guy. The National Geographic documentary had Hollywood-esque layers that slightly annoyed me (ominous music etc), though. A documentary by Werner Herzog about Alex Honnold would be fascinating; something in the vein of his 1974 "The Great Ecstasy of Woodcarver Steiner" [1,2]. I would have loved to see more of the philosophical, introspective side of Alex Honnold in the NG movie. In case of Herzog's ski jumper Walter Steiner, it was very much there.
0: https://www.youtube.com/watch?v=tnRoda7Ke2w
1: https://en.wikipedia.org/wiki/The_Great_Ecstasy_of_Woodcarve...
2: Full movie here: https://www.youtube.com/watch?v=oTdQ2fGlrq8