Last updated: 3 October 2026
Reviewed by Jordan Morley, FA Level 2 Football Coach
Triathlon consists of three disciplines completed consecutively: swimming, cycling and running. The four standard distances are: Sprint (750m/20km/5km), Olympic (1500m/40km/10km), 70.3 Half Ironman (1.9km/90km/21.1km) and Ironman Full (3.86km/180km/42.2km). Transitions between disciplines (T1 swim-to-bike, T2 bike-to-run) add further time. Most beginners start with a Sprint and progress upward. The Ironman is one of the most demanding single-day endurance events in mainstream sport.
- Sprint: 750m/20km/5km
- Olympic: 1500m/40km/10km
- 70.3: 1.9km/90km/21.1km
- Ironman: 3.86km/180km/42.2km
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Standardized triathlon distances (Sprint, Olympic/Standard, Half-Ironman/70.3, and full Ironman) give athletes a clear progression ladder and let race results be meaningfully compared across different events of the same category — the dramatic difference in total duration between a roughly 1-hour Sprint triathlon and a 10+ hour full Ironman means these distances demand genuinely different training approaches, not just 'more of the same' scaled up.
FAQ
What are the main standard triathlon distances?
Sprint (roughly 750m swim, 20km bike, 5km run), Olympic/Standard (1.5km/40km/10km), Half-Ironman/70.3 (1.9km/90km/21.1km), and full Ironman (3.8km/180km/42.2km) are the widely recognized standard distance categories.
Do shorter and longer triathlon distances require different training?
Yes significantly — a Sprint triathlon rewards higher-intensity speed and quick transitions, while a full Ironman demands primarily aerobic endurance, fuelling strategy and pacing discipline, making training approaches genuinely different rather than simply scaled versions of each other.