Enduro is a form of off road motorcycle sport that primarily focuses on the endurance of the competitor. Enduro consists of many different obstacles and challenges. The main type of enduro event, and the format to which the world enduro championship is run, is a time-card enduro, whereby a number of stages are raced in a time trial against the clock.There is a World Enduro Championship (WEC) that has events across Europe, with a few excursions to North America. The most significant event in the Enduro calendar is the International Six Day Enduro ISDE (formerly the ISDT), where countries enter teams of riders (i.e. Enduro's "World Cup"), as well as club teams - the event combines amateur sport with the professional level sport, it also takes place in a much more geographically dispersed range of locations.