If you've ever run a marathon, it's likely that you've asked yourself at some point, "Why am I doing this?". In addition to questioning your sanity, you probably also wondered why a marathon is made up of 26.2 miles. What's with the 0.2? Why 26 instead of the nice, round 25?
The history of the distance dates back to the legend of Pheidippides, the Greek messenger who reportedly ran from the battlefield in Marathon to the capital city, Athens, to report victory. While the race was never run in the ancient Greek Olympic games, it was introduced in 1896—the first year of the modern-era Olympic Games—with the distance set at 40 kilometers (24.85 miles) to honor the approximate distance of Pheidippides' fabled run.
If 24.85 miles already seems plenty long, you can blame British royalty—specifically, Queen Alexandra, wife of King Edward VII—for tacking on the extra 1.35 miles. During the 1908 London Olympics, the queen reportedly requested that the route be altered so the royal family could watch both the start of the race at Windsor Castle and the finish in front of the royal box in the stadium. Once the distance had been increased, the Olympic committee didn't see fit to change it back.