Backyard ultra

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What Wikipedia says

The backyard ultra or last one standing is a form of ultramarathon race where competitors must consecutively run the distance of 6.706 kilometres (4.167 mi) in less than one hour. Each loop, commonly referred to as a "Yard", is 100⁄24 miles, so in 24 hours, a competitor would run 100 miles.

Excerpt from the Wikipedia article “Backyard ultra”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Lobepaq, CC BY-SA 4.0, via Wikimedia Commons.