In September 2013, five weeks before Kona, I raced the Big Kahuna Half Ironman in Santa Cruz. No taper. Full training load. I swam 25 minutes, biked 2:20 at 261 watts, and ran 13.4 miles at 6:36 per mile.
That 6:36 run off a hard bike at Ironman effort, on no taper, in a half-distance race, is sub-9 Ironman fitness. The HIM-to-IM conversion makes this clear. A 6:36 HIM run projects to roughly a 7:00-7:15 IM run in cool conditions. Pair that with my 4:40-4:50 bike and a sub-60 swim, and you're looking at 8:45-8:55.
I didn't run sub-9 until Ironman Texas in 2018. Five years later.
The fitness was there in 2013. The expression took until 2018. That gap is what I call the expression deficit, and I think most serious endurance athletes have one.
The Five Years of Partial Expression
Here's what happened between Big Kahuna 2013 and Ironman Texas 2018.
Kona 2013 (9:40): My glute seized in the first minute of the bike. I soft-pedalled for 25 minutes at 145 watts before getting back to race power. The run was compromised from the start. Single-day variance overwrote the fitness.
Ironman South Africa 2014 (9:53): Raced on half-Ironman training volume. Hilly, hot course. The sprint finish for 3rd place was exciting, but the 9:53 was a course-conditioned time that didn't reflect my flat-course potential.
Ironman Arizona 2014 (9:11): My chain snapped in the first minute of the bike. Six and a half minutes lost before I was back racing. Despite the chain, this was a 29-minute PR and my closest approach to sub-9 yet. The flat course helped, but the equipment failure cost me at least 6 minutes.
Kona 2015 (10:31): I'd moved to Boulder at altitude two months before Kona. The altitude-to-sea-level descent, combined with Kona's heat, produced my worst Kona performance. A compound failure mode I hadn't planned for.
2016-2017: Focused on Ultraman racing. No full Ironman attempts.
Ironman Texas 2018 (8:59): Cool conditions, flat course, clean execution, refined nutrition, no equipment failures, no recurring fault modes activating. Sub-9 expressed at last.
Five years. Same athlete. Same fundamental fitness band. One sub-9 finish.
What Had to Come Together
When I look at this timeline, the question isn't "why did it take so long?" The question is "what had to come together for the fitness to express itself?"
The answer is: everything.
Course. Sub-9 needs a fast course. IMSA and Kona were never going to produce it. IMAZ could have, but the chain broke. Texas was flat, fast, and purpose-selected for a time trial.
Conditions. Cool weather. Texas in April is borderline. It can be hot. In 2018 it was cool enough that heat wasn't a factor. That alone is probably worth 10-15 minutes versus Kona.
Execution. No equipment failures. No race-morning illness. No tactical errors. Clean swim, controlled bike, disciplined run. The kind of race where nothing goes wrong.
Nutrition. By 2018 I'd refined my race nutrition through dozens of races and training sessions. The fueling plan that produced bonking at Kona 2013 had been iterated out of existence.
No recurring fault modes. No glute seizures (Kona 2013). No chain breaks (IMAZ 2014). No altitude-heat interaction (Kona 2015). Every athlete has recurring fault modes. By 2018 I'd cataloged mine and built protocols to prevent or manage each one.
All of these had to be true simultaneously. Fitness alone was necessary but not sufficient. Expression required fitness plus course plus conditions plus execution plus the absence of recurring faults.
The Math of Expression
Here's a way to think about it. Imagine each of these factors as a probability:
Fitness sufficient for sub-9: 90% (you've done the training). Fast course selected: 80% (you picked a good one). Cool conditions on race day: 60% (weather is variable). Clean execution with no errors: 70% (things go wrong). No recurring fault modes activating: 80% (you've prepared but can't eliminate all risk).
Multiply those together: 0.9 x 0.8 x 0.6 x 0.7 x 0.8 = 0.24.
A 24% chance of expression on any given race attempt. That means you'd need roughly 3-4 well-chosen race attempts to have a better-than-even chance of expression. If you're only racing one Ironman per year, that's 3-4 years of waiting for the stars to align.
The numbers are illustrative, not precise. But the principle is real: the probability of expressing your best fitness on any single race day is much lower than most athletes assume. And the gap between "I have the fitness" and "the race produced the result" is where most athletes lose their best performances.
Closing the Expression Deficit
Knowing that the deficit exists changes how you approach race planning.
Race more on fast courses. If expression requires multiple attempts, give yourself more attempts on courses that favor your goals. Don't waste your sub-9 attempt on a hilly course in August heat.
Catalog your recurring fault modes. Every athlete has them. Mine include glute cramping, GI issues in extreme heat, and equipment failures on rough roads. Write them down. Build prevention protocols for each one. Review the catalog before every A-race.
Separate fitness assessment from race results. A 10:31 at Kona doesn't mean your fitness regressed from 9:11 at IMAZ. It means Kona is a different course in different conditions with a different expression multiplier. Track your fitness through build-test races and training metrics, not through race results on incomparable courses.
Be patient. The expression deficit is real. Sub-9 fitness existed in my body from 2013. It took until 2018 to express it. That's not failure. That's the normal timeline for an age-group athlete who races 1-2 Ironmans per year to get all the factors aligned simultaneously.
The gap between what your body can do and what race day produces is not a fitness problem. It's an expression problem. And expression problems have different solutions than fitness problems.
Build the fitness. Then systematically remove the barriers to expressing it. That's how a 2013 Big Kahuna 4:19 eventually becomes a 2018 Ironman Texas 8:59.
Want to work with me? I coach athletes from first-time Ironman to Ultraman.