I've never seen a sport like this: mountain running! It's not just hiking, but a high speed race-to-the-top that requires not only the skills for climbing, but also the fitness level needed for running a horizontal marathon! Make sure to click CC for English subs, and check out this amazing climb to the top!
It's just 3km, and it takes a little over 2 hours, but it's totally vertical, and that's not joke! This was the first vertical running 3,000m race, and it had a pretty great turn out!