GENERAL KNOWLEDGE

Detailed explanation-1: -The random boost in mileage ending up sticking, and in 1921 the length for a marathon was formally standardized at 26.2 miles (42.195 kilometers).

Detailed explanation-2: -The marathon is a long-distance foot race with a distance of 42.195 km (26 mi 385 yd), usually run as a road race, but the distance can be covered on trail routes. The marathon can be completed by running or with a run/walk strategy. There are also wheelchair divisions.

Detailed explanation-3: -The next several Olympics saw a variety of distances for the marathon, but by the 1924 Olympiad in Paris, the 26 mile, 385 yard distance was adopted by the IAAF as the official marathon length, and it has not changed since.

Detailed explanation-4: -The short answer is that marathons are set at 42.195 kilometers (26.2 miles) because the International Association of Athletic Federations (IAAF) officially adopted that in 1921.