A triathlon is an endurance event consisting of three different sports: running, cycling, and swimming. The term 'triathlon part' refers to the individual components of the event. The RUN portion of a triathlon is typically the first LEG of the race, and is usually the longest distance. The LEG portion of a triathlon is the second LEG of the race, and is usually shorter than the RUN. The SWIM portion of a triathlon is the third and final LEG of the race, and is usually the shortest distance.