800m

Athletics 800 metres
800 metres final in Daegu 2011.
Men's records
World	David Rudisha 1:40.91 (2012)
Olympic	David Rudisha 1:40.91 (2012)
Women's records
World	1:53.28 (1983)
Olympic	Nadezhda Olizarenko 1:53.43 (1980)

The 800 metres, or 800 meters (US spelling), is a common track running event. It is the shortest common middle-distance running event. The 800 metres is run over two laps of the track (400 metre track) and has been an Olympic event since the first games in 1896. During indoor track season the event is usually run on a 200-metre track, therefore requiring four laps.

The event was derived from the imperial measurement of a half a mile (880 yards), a traditional English racing distance. Imperial racing distances were common in the United States. American high schools (in the name of the NFHS) were the last to convert to metric distances in 1980, following the NCAA's conversion in 1976. Countries associated to the English system converted to metric distances after the 1966 Commonwealth Games. 800 m is 4.67 m less than half a mile.

The event combines aerobic endurance with anaerobic conditioning and sprint speed. Both the aerobic and anaerobic systems are being taxed to a high extent, thus the 800 metre athlete is required to combine training between both systems.

Runners in this event are often fast enough to compete in the 400 metres and/or the 4 × 400 metres relay but only Alberto Juantorena and have won major international titles at 400 m and 800 m. If they are so inclined, 400 m runners are usually encouraged to run the 200 metres while 800 m runners are encouraged to run the 1500 metres.

The 800 m event is also known for its tactical racing techniques. Because the 800 m event is the shortest event that has all the runners converge on lane one, positioning on the cut-in is critical to the outcome of the race. It is commonly believed that getting the first or second position early in the race is advantageous as these positions are not usually caught up in the pack. Olympic champions Dave Wottle, Yuriy Borzakovskiy and others have defied that logic by running a more evenly paced race, lagging behind the pack and kicking past the slowing early leaders. Often the winner of 800 m races at high levels are not determined by the strongest runner but instead by the athlete with the best positioning near the end of the race. This can lead to the most exciting aspect of the 800 m which is its high probability of an upset.