A 12-hour run is a form of ultramarathon in which each competitor tries to run as far as possible in 12 hours. The event is typically held on loops, but sometimes is held on tracks.If the loop is less than 1 km, run direction changes every 2-4 (sometimes 6) hours. Some races are held on trails and others are held on sidewalks in city parks. Top runners will often run or more (the best doing about ), depending on conditions. Some participants will have a crew to help them, while others set up a camp with their equipment and supplies near the starting area, with good access from each loop.

Records

+ World records of 12 hour Women Men Athlete Distance (m) Place Athlete Distance (m) Place Road Satu Lipiäinen 153,600 Kokkola, 20 May 2023 Alexander Sorokin 177,410 Tel Aviv, 7 January 2022 Track Camille Herron 149,130 Phoenix 9/10 December 2017 Zach Bitter 163,785 Phoenix 14 December 2013

See also One hour run 24-hour run

References