Quadrathlon vs. Duathlon — What's the Difference?

A quadrathlon (or quadriathlon, tetrathlon) is an endurance sports event composed of four individual disciplines. All four disciplines are completed in succession and the lowest overall time decides the winner.

Duathlon is an athletic event that consists of a running leg, followed by a cycling leg and then another running leg in a format similar to triathlons. The International Triathlon Union governs the sport internationally.

(sports) A contest involving four successive events, usually swimming, kayaking, cycling, and running.

An athletic contest consisting of running and cycling.