Wingsuit flying is one of the worlds most dangerous extreme sports.
Competitors dive off a mountain in a special suit, then glide through the trees below at speeds up to 155 miles per hour.
Last month, the first Wingsuit Flying World Championships were held in China, and only 20 people on Earth were qualified to compete.
Norway's Espen Fadnes came in second place. Before competing in the championships, a short documentary called "Split of a Second" was made about Fadnes. In it, he explains how he become a daredevil, what motivates him, and how it feels to step off a cliff.
His insights give you the clearest picture yet of why a human being could much such a seemingly insane activity their livelihood.
The words on the images in this slideshow are direct quotes from Fadnes.
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