12 Hour Run
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A 12 hour run is a form of ultra marathon in which a competitor runs as far as they can in 12 hours. They are typically held on one to two mile (1.6-3.2 km) loops but sometimes are held on 400 meter (.25 mile) tracks. Some races are held on trails and others are held on sidewalks in city parks. Top runners will often run 60 miles (96.5 km) or more, depending on conditions. Some participants will have a crew to help them or others just set up a camp with all the gear and supplies they need near the starting area to access each loop.
