IRONMAN training plan: a coach's 32-week blueprint.
Most IRONMAN plans you'll find online are spreadsheets. They tell you what to do, not why, and they don't adapt when life happens. This is how I actually coach age-groupers and pros to the IRONMAN finish line — including Kona — across 24–32 weeks of structured work.
- →Plan in 4-week blocks: 3 weeks build, 1 week recovery. Don't skip the recovery week.
- →Long bike + long run are the two non-negotiables. Everything else supports them.
- →Brick workouts teach the legs to run off the bike. 2–4 hours bike + 20–45 min run is the highest-value session of the week in late build.
- →Race-week fueling is rehearsed on every long session — never invent it on race day.
Phase 1 — Base (weeks 1–10).
The job in base is to build an aerobic engine that can absorb the intensity later. Zone 2 volume across all three sports, technique work in the pool, strength 2× per week, and one weekly threshold session per discipline so you don't lose top-end. Most weeks: 2–3 swims, 3–4 bikes, 4 runs. Total volume ramps gradually — never more than ~10% week over week, with a recovery week every fourth.
Phase 2 — Build (weeks 11–22).
Race-specific intensity goes up. Long bike sessions extend toward 5–6 hours with race-pace blocks of 90–180 minutes at IF 0.75–0.80. Long runs build to 2:15–2:45 with the back half at marathon-pace effort. Brick workouts become the centerpiece — finishing the long bike with a 20–45 min run teaches the legs what IRONMAN race day actually feels like.
Phase 3 — Peak (weeks 23–28).
The biggest week of the cycle lands ~3–4 weeks out: 18–22 hours, longest bike (5–7h), longest run (2:30–3:00), and a full nutrition rehearsal at race-pace effort. Then you stop building and start protecting.
Phase 4 — Taper (weeks 29–32).
Volume drops 30–50% per week. Intensity stays — short, sharp sessions keep the engine primed without adding fatigue. Sleep, hydration, and carbs become the workout. The taper is where over-trained athletes panic and undo months of work; the discipline is doing less.
Nutrition: rehearse, don't invent.
Race day fueling targets are 80–110g carbs/hour on the bike, 60–90g/hour on the run, and 500–1,000mg sodium/hour depending on sweat rate. Every long bike and long run in build phase tests the exact products, bottles, and timing you'll use on race day. Nothing new on race day — not the gel, not the bottle, not the strap.
FAQ
How many weeks should an IRONMAN training plan be?
A first-time IRONMAN benefits from 24–32 weeks of structured training on top of a 6–12 month aerobic base. Experienced athletes often use 16–20 week build cycles after staying close to their fitness floor year-round.
How many hours per week does IRONMAN training take?
Most age-groupers train 10–16 hours/week in build phases and 18–22 hours in peak weeks. Stronger swimmers/cyclists can finish closer to 10–12. Time-crunched plans are possible at 8–10 hours/week, but they trade margin on race day.
Should I follow a generic plan or get a coach?
Generic plans get you to the finish line. Coaching is what matters when you want a specific time, are managing limited time, returning from injury, or trying to qualify for Kona. A coach adapts every week based on real data — sleep, HRV, sessions completed, life load.
What is the most common mistake in IRONMAN training?
Too much intensity, not enough Zone 2. The aerobic engine is what holds together IRONMAN race pace. Most age-groupers ride and run too hard on easy days and don't go hard enough on the few quality sessions that actually drive adaptation.
Want this plan built around your life?
I coach age-groupers and pros to IRONMAN finishes and Kona slots. Apply for 1:1 coaching and we'll build the exact 24–32 week plan around your race, your schedule, and your data.
Boston-based · Trilingual EN/PT/ES · RRCA · USAT · TrainingPeaks L2 · 12× Boston qualifier