The Marathon is a long-distance running as a road race with an official distance of 42.195 kilometres (26 miles and 385 yards). The event was introduced by Greek soldier Pheidippides that was a messenger from Battle of Marathen to Athens.
In 1896 Marathon was one of the original events of Olympic Games but not standardized until 1920.But gradually it has become more famouse .More than 500 marathons are held throughout the world each year. . Smaller marathons, such as the Stanley Marathon, can have just dozens of participants, while larger marathons can have tens of thousands of participants.