Try to watch this and not get sweaty palms.

Alex Honnold makes the first free solos of the largest walls in North America. He scales 2,000 feet with only shoes and chalk bag—no rope, no safety, and no room for error. Though he's a superhero on the walls, off the rock Alex is a shy, self-effacing young guy living in his van. He's sort of a Clark Kent-Superman character.