Jordi Tosas is one of the most highly qualified mountain guides in the world. He knows the Alps and the Pyrenees like the back of his hand. However, after nearly 30 years of using a very traditional approach to the mountains, a chance encounter with ultrarunner Kilian Jornet led him to reevaluate. Spending time in the mountains together has led the two to combine their very different approaches to climbing, and for Tosas truly embracing the ultra-light and ultra-fast lifestyle.