Mu bogging, also known as mud racing, mud running and mud drags, is a form of off-road motorsport popular in Canada and the United States in which the goal is to drive a vehicle through a pit of mud of a set length. Winners are determined by the distance traveled through the pit or, if several vehicles are able to travel the entire length, the time taken to traverse the pit. Typically, vehicles competing in mud bogs are four-wheel drives.