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A half marathon is a road running event of .〔(USATF: Course Measurement and Certification Procedures )〕 It is half the distance of a marathon and usually run on roads. Participation in half marathons has grown steadily. One of the main reasons for this is that it is a challenging distance, but does not require the same level of training that a marathon does.〔 In 2008, Running USA reported that the half marathon is the fastest growing type of race.〔 A 2010 article by ''Universal Sports'' echoed the growing popularity of the distance.〔 It is common for a half marathon event to be held concurrently with a marathon, using almost the same course with a late start, an early finish or shortcuts. The half marathon is also known as a 21K, 21.1K or 13.1 miles, although these values are rounded and not formally correct. ==World record progression== World records in the half marathon are ratified by the International Association of Athletics Federations, the international governing body for the sport of athletics.〔(【引用サイトリンク】title=Records by discipline: Men's outdoor half marathon )〕〔(【引用サイトリンク】title=Records by discipline: Women's outdoor half marathon )〕 The official IAAF world record for men is 58:23, set by Zersenay Tadese of Eritrea on March 21, 2010 at the Lisbon half marathon in Portugal,〔 and for women is 1:05:09, set by Florence Kiplagat of Kenya on February 15, 2015, in Barcelona, Spain.〔(【引用サイトリンク】title=Records by discipline: Women's outdoor half marathon )〕〔Pending ratification on May 1, 2015.〕 This list is a chronological progression of record times for the half marathon. Key: 抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Half marathon」の詳細全文を読む スポンサード リンク
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