Why It's Almost Impossible to Run a Two-Hour Marathon

One of the world's finest distance runners came so close to achieving the greatest feats of athleticism in history: a sub two-hour marathon. To do it, the Eliud Kipchoge should have maintained an average pace of at least 13.1 miles per hour. So, we timed how long WIRED staffers could run at that speed. Needless to say, we didn't last long. Here's why only a handful of people in the world could ever come close to a two-hour marathon.