The World’s 10 Toughest Races

As if running a marathon wasn’t tough enough, humans decided to make it tougher—running distances of 100 or 200 or more miles! And, if that wasn’t tough enough—humans began running ultramarathons in extreme conditions, on impossible terrain, with the threat of dangerous wildlife looming. What are these ultramarathons? We round up the top ten toughest … Read more