Alex Honnold is an American rock climber best known for his free solo ascents of big walls. Honnold rose to worldwide fame in June 2017 when he became the first person to free solo a route on El Capitan in Yosemite National Park, a climb described in The New York Times as "one of the great athletic feats of any kind, ever". Honnold also holds the record for the fastest ascent of the "Yosemite Triple Crown", an 18-hour, 50-minute link-up of Mount Watkins, The Nose, and the Regular Northwest Face of Half Dome. In 2015, he won a Piolet d'Or in alpine climbing with Tommy Caldwell for their completion of the enchainment of the Cerro Chaltén Group in Patagonia over 5 days.

In mountaineering and climbing, enchainment is climbing two or more mountains or climbing routes on a mountain in one outing. Rock climbing two or more routes in this manner are also called a "link up" in the United States. Climbers may do an enchainment of easy routes as a way of training for a more difficult objective, but some enchainments of hard routes are a prize in their own right, a notable example being the great north faces of the Alps.