the activity or sport of running very long distances or competing in running races, such as ultramarathons, that are longer than usual races

Ultra-running is any run that exceeds the 26 miles of a marathon. 超跑是指任何超过马拉松26英里的超长跑。

To prep his body, Robinson took up ultrarunning and began putting in 50 miles a week training on dirt trails. 为了让自己的身体做好准备，罗宾逊选择了超长跑，开始每周进行50英里的泥土路训练。