Haile Gebrselassie of Ethiopia ran the first sub-2:04:00 marathon in September, 2008 in Berlin, running 2:03:59. It must be noted that this was an unusual situation, since he had no strong competitors in the race and had help from several pacemakers. Nonetheless, it is a fantastic achievement.
In April, 2011, Geoffrey Mutai of Kenya ran 2:03:02 in the Boston Marathon, the fastest marathon run ever. This was not considered as a world record because the Boston course "wasn't hard enough" (it is net downhill, and it is a one-way course rather than a closed loop, so a runner can have a net tailwind). To anyone who has ever run both courses, this is the sheerest absurdity. Berlin, Chicago and London are fast flat courses where record tries are routinely made, whereas Boston and New York are slow courses due to hilly terrain. Also, Boston is extremely competitive and does not allow pacers, so a runner cannot "tuck in" behind teammates as is possible (and was done) in Berlin. There's a very good reason that nobody ever plans to attempt a world record run in Boston or New York any more - they always target Berlin, Chicago or London.
So while Haile still has the world record, many (including me) consider Geoffrey's run to be the greatest marathon run ever.
Read more: Who_is_the_mens_marathon_world_record_holder
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It's Thrust SSC, the holder of the world land speed record of 763 mph
The IAAF regards Patrick Makau's 2:03:38 (Berlin 2011) to be the official men's World Record. However the fastest marathon ever (2:03:02) was run by Geoffrey Mutai (Boston 2011).
Gebreselassie an Ethiopian marathon runner (World record holder) has refused to run the Marathon at the Beijing Olympics due to bad air quality but will run the 10,000 meters.
1:41.01 by world record holder David Rudisha of Kenya.
Geoffrey Mutai ran 2:03:02 at the 2011 Boston Marathon. The recognized IAAF world record (2:03:38) however was set by Patrick Makau at the 2011 Berlin Marathon.
Wilson Kipketer of Denmark holds seven of the ten fastest 800m times in history, including his world record of 1.41.11 from 1997.
The current (as of 7 January 2010) world record holders are:Men'sHaile Gebrselassie (Ethiopia) - 2:03:59 (Berlin Marathon, 28 September 2008)Women'sPauls Radcliffe (United Kingdom) - 2:15:25 (London Marathon, 13 April 2003)
a half marathon
The fastest walking speed ever recorded was by Usain Bolt, the world record holder in the 100m and 200m sprints. While walking is not his specialty, he has been recorded walking at a pace of around 3-4 miles per hour.
Patrick Makau of Kenya ran 2:03:38 on September 25th 2011 at the Berlin Marathon. This is regarded as the World Record, according to the International Association of Athletics Federations. Geoffrey Mutai of Kenya ran faster (2:03:02) at Boston Marathon on April 18th, 2011, but the legendary Boston course does not meet IAAF layout standards.The fastest marathon time run by a woman is 2:15:25. This was accomplished by Paula Radcliffe of Great Britain on April 13th 2003 at the London Marathon, and is regarded as the women's World Record by the IAAF.