Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The first record in the 100 metres for men (athletics) was recognised by the International Amateur Athletics Federation, now known as the International Association of Athletics Federations, in 1912. The record now is 9.58 seconds which was run by Usain Bolt. As of 21 June 2011 (2011 -06-21)[update], the IAAF had ratified 67 records in the event, not including rescinded records. The 100 metres, or 100-metre dash, is a sprint race in track and field competitions. The shortest common outdoor running distance, it is one of the most popular and prestigious events in the sport of athletics. It has been contested at the Summer Olympics since 1896 (1928 for women). The reigning 100 m Olympic champion is often named "the fastest man/woman in the world".