Video: The Hardest 400 Meter Race You'll Ever See

The Red Bull 400 is only 400 meters in length, and yet it just might be the toughest race of that distance in the world. Competitors race up the side of a mountain in Plancia, Slovenia in a grueling test of speed, strength and endurance. But just telling you about it really doesn't do the race justice. You'll need to watch the video below to see what I'm really talking about.

My legs hurt just watching it. Brutal!