12 Week Advanced Competitive Half Distance Training Plan - 2026
This plan is for experienced athletes preparing for a middle distance / 70.3 race with a performance goal, and who are ready for a more focused, structured build. It is written in the way we coach at TCC Endurance: practical, progressive, honest, and built around consistent training rather than chasing one-off hero sessions.
Across the 12 weeks you will build towards race-specific fitness with a strong mix of endurance, controlled intensity, key bike-run work and taper. The weekly volume sits around 10-13 hours, so this is best suited to athletes who can already train consistently and want a proper performance-focused build.
Who this plan is for
- Advanced Competitive athletes preparing for a middle distance / 70.3 triathlon.
- Athletes with race experience or a strong endurance background who want a more performance-focused plan.
- People who want structure, progression and clear guidance rather than a random collection of sessions.
- Athletes who can train most weeks between 10-13 hours.
What to expect
The plan includes structured swim, bike and run sessions with clear purpose behind the work. You will move through base fitness, endurance development, race-specific preparation and taper, with the key sessions placed where they matter most.
The aim is to help you arrive at race day fit, sharp, confident, and ready to make good decisions when the race starts asking questions.
TCC coaching approach
At TCC Endurance we believe the best race results come from consistency, smart progression and knowing when to push and when to absorb the work. This plan reflects that. There are challenging weeks, but the training is there for a reason, and the easier days are just as important as the harder ones.
If you follow the plan well, listen to your body, and keep the bigger picture in mind, you will give yourself a strong platform for a successful middle distance race.
Included in the plan
- 12 weeks of structured middle distance / 70.3 training.
- Swim, bike, run and supporting endurance sessions.
- Progressive weekly structure leading into race-specific preparation.
- Clear session guidance so you know what each workout is trying to achieve.
- A taper into race day so you arrive fresh and ready, not flattened by the training.
This plan has been reviewed and updated for the 2026 season.
If you are not sure whether this is the right plan for you, or you have any questions before getting started, email info@tccendurance.com and we will point you in the right direction.
UK-based university Sport Science lecturer and exercise physiologist, and founder of TCC Endurance. Sports Science graduate with an MRes in Exercise Physiology. Level 3 British Triathlon coach and TrainingPeaks Level 2 certified. I take a research-led, data-driven approach to 70.3 and Ironman prep, turning physiology into practical training that fits real life. 20+ years coaching and mentoring coaches.