 Free solo climber, Alex Honnold, has accomplished some of the most amazing feats of climbing ever done on earth, including ascending the 3,000 foot El Capitan in Yosemite National Park without a harness or rope of any kind. That's taller than two Empire State buildings stacked on top of each other. In order to achieve something so incredibly dangerous where a single mistake is instant death, Honnold stakes his life on preparation. He does numerous run-throughs with ropes so he knows exactly where every single step will be, which gives him the confidence on climb day. He's always insisted that he feels fear. He just prepares to the point that he knows who'll be able to accomplish his goal by mentally rehearsing everything that could happen. The preparation is what keeps him at ease. Fear never totally disappears, but each practice run is like a rock hammer chipping away at stone. There is no adrenaline rush, he once told 60 minutes about his climbs. If I get a rush, it means something has gone horribly wrong.