Metrication in the United States traditional mile-based lengths. In the Olympics, athletes run 1500 meters, not 1600 meters. Running races in the U.S. are usually run in metric distances (e.g., the 100 metres dash or the 5K run), although the mile distance remains popular. But even 5 and 10 kilometer races most often have mile markers on the course, and no kilometer markers. Long-distance races are often measured in kilometers, although exceptions exist (generally 10 mile races). The marathon is referred to as a 26.219-mile race (the official marathon standard distance originally being in English units — 26 miles, 385 yards) rather than 42.195 km.
Athletics at the 1912 Summer Olympics – Men's marathon finished. These were the standing world and Olympic records (in hours) prior to the 1912 Summer Olympics. The distance was nearly two kilometres shorter; nevertheless, Ken McArthur's winning time is registered as an Olympic record. Athletics at the 1912 Summer Olympics – Men's marathon ] The men's marathon was a track and field athletics event held as part of the athletics at the 1912 Summer Olympics programme. It was the fifth appearance of the event, which is one of 12 athletics events to have been held at every Summer Olympics. The distance used was 40.2 kilometres, nearly 2 full kilometres