Ever wondered what it is like to run the very grueling Ultra-Trail du Mont-Blanc trail race? If so, you can wonder no more. This video, entitled Endure, was created by Columbia Sportswear in collaboration with Teton Gravity Research, and it gives us an inside look at this very demanding race. The 12-minute long short documentary takes us out onto the 103-mile long course that passes through France, Italy, and Switzerland to provide an incredible look at what is widely considered to be one of the toughest trail running events in the entire world. As you’ll see, it pushes competitors to their very limits, bringing on both the highest of highs and lowest of lows along the way.