Why You Fade on the Triathlon Run: Bike Pacing, Fueling, Heat, or Run Fitness?

I lost the Athena overall win at the Olympic-Distance Triathlon National Championships by just 22 seconds—and the eventual winner passed me during one of my walk breaks.

It would be easy to say that I simply faded on the run. But that describes what happened. It does not explain why.

In Episode 7 of Coach Erin Says, I think through the race with you and investigate the evidence. Did I overbike? Did I get my fueling wrong? Was the heat responsible? Is my run fitness the problem? Or did the decisions I made once the run became uncomfortable turn a manageable challenge into repeated walk breaks?

Watch or Listen

Watch Episode 7 on YouTube

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In This Episode

Coach Erin investigates:

• Why a triathlon run fade may begin before you reach T2
• Whether an aggressive swim start can affect the rest of the race
• How bike pacing and late power spikes can compromise the run
• How to determine whether fueling was actually the problem
• The difference between strategic and reactive walking
• How heat changes the cost of your planned effort
• What can happen when race-day discomfort replaces your execution plan
• What Erin is changing before IRONMAN 70.3 Michigan

What the Evidence Showed

I did not find one simple cause. The late climb on the bike may have raised the cost of beginning the run. The heat made the planned effort feel harder, and my run durability still has room to improve.

But I did not find evidence of a straightforward fueling failure. I followed a practiced plan, finished my fluids and carbohydrates, and experienced no hunger, cramping, dizziness, gastrointestinal distress, or sudden energy crash.

The clearest finding was that I stopped following my predetermined run plan. When the effort became uncomfortable, I created a new heart-rate rule during the race. My watch changed from a tool guiding my execution into a tool I could use to justify walking.

The physical factors were real. But my response to those factors made the fade larger than it needed to be.

The Big Takeaway

“I faded on the run” is only the beginning of the investigation.

Look backward. Examine the swim, bike pacing, fueling, hydration, heat, accumulated fatigue, run fitness, and the decisions you made after the effort became uncomfortable.

Discomfort is information. It is not always an instruction.

Investigate Your Own Triathlon Run Fade

• Did you follow your bike pacing plan, including on climbs and into T2?
• Did you complete a practiced fueling and hydration plan?
• Did the weather require an adjustment to pace or cooling?
• Did you begin the run at the planned effort, or race the people around you?
• Were your walk breaks part of the plan, strategically necessary, or improvised?
• What will you practice before your next race?

Want a structured way to review your race? Use the Triathlon Run Fade Checklist: 6 Questions to Diagnose What Went Wrong to work through bike pacing, fueling, heat, run fitness, and race-day execution.

Want Help Turning Race Data Into Better Execution?

Personalized coaching can help you connect the dots between training, pacing, fueling, recovery, race conditions, and the decisions you make when the original plan becomes difficult.

Explore triathlon coaching with 3 Goals Multisport.

About the author: Coach Erin Byrge is a triathlon coach, longtime multisport athlete, and founder of 3 Goals Multisport Coaching. She helps everyday athletes train consistently, execute confidently, and pursue meaningful goals within real life.

Train with grit, give yourself grace, keep chasing your goals, and go make yourself proud.