Brick: A combined bike/run workout involving repeat intervals of each discipline.

   Buoys: Floats used to mark the swim course.

   Clip-ons: An extension of the handlebars, enabling the cyclist to take on a more aerodynamic position while on the bike.

   Draft zone: An imaginary area approximately three bicycle lengths long and two metres wide surrounding each competitor during the bike segment. This zone is used to distinguish drafting violations during events where drafting is not allowed.

   Drafting: The technique of riding in a pack during the cycling event. For safety reasons, drafting is forbidden in Long Distance and age-group races.

   Transition: The period in between stages of the triathlon, where competitors change equipment for the next discipline (swim to bike and bike to run).

   Transition area: The area where transitions take place. Most events have one main transition area but occasionally there will be two separate areas for each transition (swim to bike and bike to run).

   Transition time: The time it takes each competitor to complete their transition. This time is counted in their overall time for the race.

Credit: IOC

For further info., please visit http://www.olympic.org/uk/sports/programme/disciplines_uk.asp?DiscCode=TR.