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Road running is the sport of running on a measured course over an established road (as opposed to track and field and cross country running). These events are usually classified as long-distance according to athletics terminology, with races typically ranging from 5 kilometers to 42.2 kilometers in the marathon. They may involve large numbers of runners or wheelchair entrants. The three most common IAAF recognized distances for "road running" events are 10K runs, half marathons and marathons. Despite this, there are far more 5K road race events, due to their popularity for charity races and similar, less competitive reasons to hold an event. Road running may offer those involved a range of challenges and interests such as dealing with hills, sharp bends, varied surfaces, inclement weather, and involvement in a large group. Aerobic fitness, or the ability of the body to use oxygen, is the biggest factor contributing to success. The impact of running on roads puts more stress on the feet, knees and lower back than running on dirt or grass. It can compensate by providing a consistent, level surface. It may put less strain on the Achilles tendon.〔(Top 10 Running Surfaces - Runner's World General )〕 Before engaging in road running, one should choose a shoe that best suits one's foot type and running style.〔http://www.medicinenet.com/running/page7.htm#what_shoes_should_i_wear_when_running〕 Road running is one of several forms of road racing, which also include road bicycle racing and motor vehicle road racing. ==Courses== Race courses are usually held on the streets of major cities and towns, but can be on any road. The IAAF recognizes nine common distances for road races: , , , half-marathon (21.097 km or 13.1 mi), , , marathon (42.195 km or 26.2 mi), , and Ekiden marathon relay.〔(IAAF Road Running Records )〕 Other common distances include , , , and . Some major events have unique distances. The "Round the Bays" run in Auckland, New Zealand is ; the Falmouth Road Race in Falmouth, Cape Cod is ; "City to Surf" in Sydney, Australia is ; Honolulu's "Great Aloha Run" is ; the "King Island Imperial 20" is long; and the "Charleston Distance Run" in Charleston, West Virginia is . Most road race courses are certified to be accurate to within 0.1%, that is, to within 10 m for a 10 km race.〔(UK Road Running Race Course Measurement )〕 Certified courses are often intentionally lengthened by one metre per km to ensure that they are not short of the stated distance. A Jones Counter attached to a bicycle is used to measure course length. Remeasurement to verify the length is undertaken when a world record is set on a course. 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「Road running」の詳細全文を読む スポンサード リンク
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