Competitors swim, then cycle, then run—consecutively and without major pause—over distances that range from short sprint formats to full Ironman length. That multi-discipline race is the triathlon. Transitions between disciplines form a distinct skill of their own.

Standard Olympic-distance triathlon consists of a 1.5 km swim, 40 km cycle, and 10 km run. Longer and shorter variants exist for different athlete populations. Success requires balanced proficiency across all three disciplines and the ability to manage accumulating fatigue. Equipment rules govern wetsuits, bicycles, and transition-area conduct.

Training must develop three distinct movement patterns while avoiding overuse injury. Race-day logistics—nutrition, pacing, and transition efficiency—strongly influence results. The triathlon has grown from a niche endurance challenge into a mainstream Olympic and mass-participation sport.

The moment of leaving the bike and starting to run tests every aspect of preparation.