トレイルランニング
Trail running races are organised globally. Due to the relatively short history of trail running as an organised sport, there are very few established organizing bodies. For example, in the United States, the American Trail Running Association was only founded in 1996 to represent trail races in the US. In the United Kingdom, the Trail Running Association was formed in 1991. The International Trail Running Association (ITRA) was founded in 2013, and was first recognized by the IAAF in 2015.