That Triathlon Show

The Ironman Training Deep Dive: What Triathletes Need to Know

13 snips
Mar 19, 2026
Deep dive into Ironman training prerequisites and how much preparation time you need. Periodisation strategies, reverse periodisation and race-specific training blocks are explored. Practical simulation weekends, bricks and tapering approaches are covered. Nutrition, gut training, heat preparation and common age-group training mistakes round out the discussion.
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ADVICE

Prepare With A Base Before Signing Up

  • Do build an endurance base and enter Ironman preparation only after years of regular exercise or at least a sprint/Olympic race experience.
  • Mikael recommends doing a 70.3 first and targeting Ironman the following year unless you can commit to daily training safely.
INSIGHT

Ironman Is A Diesel Aerobic Event

  • Insight: Ironman is primarily an aerobic, energy-management event where muscular durability and economy matter more than short-term power.
  • Jack and Mikael note lifetime volume improves economy, explaining why Ironman peak age trends older than shorter distances.
ADVICE

Periodize From Volume To Specificity

  • Do periodize broadly from general to specific: build economy, then base volume, add 1–2 VO2 blocks ~6 months out, then threshold and specific blocks.
  • Jack prioritises maximizing total yearly hours and then reversing intensity toward race pace in the final months.
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