Hill Climbing is a cycling event, as well as a basic skill of the sport. As events a hill climb may either be an individual time trial (which forbids cooperation, drafting, or team tactics) or make up part of a regular road race. A hill climb usually represents an event which gains altitude continuously, usually terminating at a summit. Occasionally featured in major professional races, such as the Tour de France, they are usually referred to as mountain time trials, and are not necessarily from the bottom to the top of a hill, as they can simply be a time trial over hilly terrain.