Honnold had practiced individual segments multiple times before this attempt. Those practice runs had left rubber marks on the walls, which helped him in follow

Honnold had practiced individual segments multiple times before this attempt. Those practice runs had left rubber marks on the walls, which helped him in following a specific route. Before attempting the complete climb, Honnold verified that the rubber marks were not removed by the rains. Plus, he has a daily regimen of specific exercises, so many freeclimbs before, etc. A complete professional, not an idiot for sure. Here are more details about this climb and his preparation: http://www.nationalgeographic.com/adventure/features/athletes/alex-honnold/most-dangerous-free-solo-climb-yosemite-national-park-el-capitan/ http://www.nationalgeographic.com/adventure/features/athlete...