Badwater Ultramarathon was created in 1987.

The largest ultramarathon is the56 mile Comrades marathon in South Africa which had 12,952 entrants in 2009.

Ultramarathon Man 50 Marathons 50 States 50 Days - 2008 was released on:

USA: 31 July 2008

An ultramarathon is technically defined as any distance longer than the standard 26.2 mile (42.195) marathon. The 50 km race is usually considered the shortest ultramarathon with distances from 30-100 miles very common.

The definition of Chi Running states that Chi Running is a method of running instruction. It was developed by an American Ultramarathon runner and Tai Chi performer.