Ironman is not about speed for amateurs, even elite amateurs. It is about durability.

If you have not trained consistently for ~1,500 days or roughly 4 years, it is almost impossible to run close to your true potential off the bike: consistently.

You may hit some good races.

Then bounce straight back into fatigue, inconsistency, injury… or another bike/swim-focused block restarting the hamster loop where many athletes live.

There could be a better way:

(Patience × Consistency × Specific Strength) × Time = Ironman Run Durability

1. Patience = longer time frame

2. Consistency = much more easy training

3. Specific Strength = run durability & resilience under fatigue

Run durability is built through years of mostly very, very easy work and relentless consistency. So steady ramp with a lot of “stabilizations” phases, you can’t and should not try to stack more and more km, there is time and place for build and stability, we are triathletes, not stand alone runners!

Using the bike as a metabolic tool for simulating that demolition in key sessions is a must, but you also need to build towards that.

You do not need speed for Ironman, you need gross efficiency and resistance to fatigue.

So forget obsessing over standalone 5K, 10K, 21K or marathon benchmarks.

That is not what decides Ironman marathons.

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