Ironman Texas Heat: A Kona Test in Disguise

Pros racing Ironman Texas are not just lining up for what has been called the most competitive race of the season. They’re also stepping into the heat.

For many, this is intentional and strategic. For instance, in our exclusive interview with Magnus Ditlev (prior to his withdrawal due to shingles), he shared that his decision to race in Texas, travelling all the way from Copenhagen, was intended to test both his preparation and the race-day strategies he hopes to execute in Kona.

He is one of several pros using Texas as a sort of “dress rehearsal” for the Big Island.

With temperatures expected to reach 34C, the question equally becomes: how should age-groupers execute to have their best performance on the day?

Here are three of our top tips for racing in the heat.

1. Start More Conservatively Than You Think

Hot races are rarely won in the first half, but they are often lost there.

Early in the day, conditions can feel manageable. But in the heat, your body is already under additional stress, and that cost accumulates over time.

A slightly reduced effort early on helps limit the buildup of core temperature, which in turn preserves your ability to run later. (This is because once your core temperature rises too far, your body will force you to slow down.)

If you’re unsure, err on the side of caution. You’re far more likely to gain time by holding steady late than by pushing early.

2. Prioritize Cooling Early and Often

Cooling is not something to “add in” later; it should be part of your plan from the very beginning.

In hot and humid conditions, your body’s ability to dissipate heat is limited, so you need to actively assist it. Use every aid station with intention – for example, pour water over your head and torso, and, on the run, place ice in your suit where possible.

These small interventions help lower thermal strain, reduce perceived effort, and delay fatigue.

Importantly, don’t wait until you feel overheated. By that point, you’re already behind. Consistent, proactive cooling throughout the bike and run can make a meaningful difference in how your body holds up over time.

3. Adjust Expectations and Race by Effort

One of the biggest challenges in the heat is letting go of rigid expectations. Your “normal” pace or power may not be sustainable, even if your fitness suggests it should be.

As core temperature rises, heart rate will drift, effort will feel harder, and performance metrics will begin to decouple. This is not failure; it’s physiology.

Use rate of perceived exertion (RPE) as your primary guide, supported by heart rate. If something feels harder than it should early on, listen to that signal and adjust.

The athletes who perform best in the heat are not the ones who stick stubbornly to a plan. They’re the ones who respond intelligently to the conditions and make decisions in real time.

Best of luck in Texas!