Is the Taco Bell ultra marathon the toughest event in sports and why is the answer a resounding yes?

There may be longer races, and there may be more prestigious races, but none require the intestinal fortitude — in the most literal sense — needed to complete the International Taco Bell 50k. The 9th annual edition of the ultra marathon in Denver gets underway this weekend, and it will see runners traversing just over 30 miles, while making pit stops at a minimum of nine of the ten Taco Bell locations along the route where they must order a menu item and finish it. And better yet, it's not sanctioned by the company. They're just out there for the...