The Marathon Explained: Distance, History and How the Race Works

The marathon is the ultimate endurance running event, a race of 26.2 miles that has become a bucket-list challenge for amateurs and the pinnacle of distance running for elites. Behind its familiar name lies a fascinating history and a precise structure worth understanding.

The exact distance of a marathon is 42.195 kilometers, or 26.219 miles. That oddly specific number has a genuine historical explanation. The event is named after the ancient Greek legend of Pheidippides, a messenger said to have run from the battlefield of Marathon to Athens to announce a Greek victory, roughly 40 kilometers, before collapsing. When the modern Olympic Games were revived in 1896, they included a marathon race inspired by this story. The distance was not standardized at first, and early marathons varied in length. The now-official 26.2-mile distance was fixed at the 1908 London Olympics, reportedly to allow the race to start at Windsor Castle and finish in front of the royal box in the stadium. That figure was later formally adopted as the standard.

A marathon is run on roads over a certified course, and the winner is simply the first runner to cross the finish line. Elite races often feature "pacemakers," runners who set a fast, even pace for part of the race to help the top athletes chase fast times before dropping out. Behind the elites, thousands of amateur runners of all abilities take part in major public marathons, many raising money for charity, making these events part elite competition and part mass celebration.

The most prestigious marathons in the world form a series known as the World Marathon Majors, which includes the Boston, London, Berlin, Chicago, New York City, and Tokyo marathons. Each has its own character: Boston is famous for its history and its qualifying-time entry standard, Berlin for its flat, fast course where many world records have been set, and New York for its huge, festival-like atmosphere across the city's five boroughs.

Running a marathon is as much about strategy and preparation as raw speed. A key concept is pacing: because the distance is so long, running too fast early almost always leads to a dramatic slowdown later, often called "hitting the wall." This wall typically strikes around the 20-mile mark, when the body's stored carbohydrate (glycogen) runs low and runners must rely more on fat for fuel, which the body burns less efficiently. Managing energy, hydration, and fueling with drinks and gels along the route is central to finishing strong.

Training for a marathon usually takes months and involves gradually increasing weekly mileage, including a weekly "long run" that builds the endurance needed to keep going for hours. Even elite athletes structure their entire seasons around just a small number of marathons per year, because the race takes such a heavy toll on the body and requires long recovery.

At the very top, the marathon has seen astonishing progress. Elite men now complete the distance in a little over two hours, and elite women not far behind, times that represent sustained paces most recreational runners could not hold for even a single mile. The dream of a sub-two-hour marathon in official competition has become one of the sport's great frontiers, with a famous special-event run dipping under that barrier in controlled conditions that did not count as an official record.

Whether you are watching the leaders glide through the streets or cheering on a first-timer determined simply to finish, the marathon is a uniquely human drama. It rewards patience, planning, and sheer will, and its 26.2 miles remain one of the most respected distances in all of sport.