challenge

The most famous brand of long-distance triathlon, consisting of a 2.4-mile swim, 112-mile bike, and 26.2-mile run.

A runner who runs at least one mile (or specified distance) every single day without taking any rest days, often for years.

Running on unpaved surfaces such as hiking trails, forests, or mountains, emphasizing adventure and technical skill over raw speed.

Any footrace longer than the traditional marathon distance of 42.195 kilometers, ranging from 50k to hundreds of miles.