The Ironman Marathon Is NOT a Marathon

Being a strong runner does not mean you are ready to run well in an Ironman. The Ironman marathon is not a normal marathon. It starts after a 2.4-mile swim, 112-mile bike, hours of fatigue, fueling decisions, pacing mistakes, and muscular damage that have already shaped what your run can become. In this episode, Coach Justin and Coach Katie break down why runners moving into long-course triathlon often struggle on the Ironman run — and why the answer is not always “more run training.” If you want to run better off the bike, you need to understand how bike fitness, fueling, pacing, patience, and recovery all change the marathon. What You’ll Learn Why strong runners still fall apart in the Ironman marathon How bike fitness protects your run more than extra mileage Why fueling mistakes on the bike can ruin the marathon How to rethink pacing when the run starts on tired legs Timestamps: 00:00 – Why runners misunderstand the Ironman marathon 03:02 – Standalone marathon training vs Ironman training 08:41 – Why Ironman run training starts with bike fitness 17:44 – Why marathon expectations do not transfer to Ironman 22:03 – How overbiking sabotages the run 33:04 – Why bike fueling determines marathon survival 43:25 – Flavor fatigue, texture fatigue, and Ironman nutrition 47:23 – How long runs should change for Ironman 53:49 – How much run intensity belongs in Ironman training 1:02:22 – Why patience off the bike matters 1:10:17 – Recovery differences between marathon and Ironman training 1:25:35 – Final thoughts