The Infirmary | Fixing Broken Endurance Athletes

Visualization is one of the most widely cited mental skills in endurance sport, and one of the least practiced. Athletes talk about it, nod when a coach brings it up, and go home without doing any of it. In this solo episode, I break down visualization into three distinct types — outcome imagery, in-race imagery, and coping imagery — with a specific protocol for each, built around one core premise...

Mikael Eriksson founded Scientific Triathlon in 2015 and has coached full time since 2017. He also hosts That Triathlon Show, a podcast with over 700 episodes in its archive that has become one of the most comprehensive educational resources in the sport. This conversation covers the question that organized it: what does a sensible training philosophy actually look like — and how do you build one...

My coaching intake questionnaires ask about fitness history, equipment, fueling, and injury background, but the thing athletes flag most consistently is imposter syndrome — and it appears whether an athlete has done fifteen Ironmans or is two weeks out from their first sprint triathlon. In this solo episode of The Infirmary, I break down the two types of self-talk — motivational and instructional...

Mark McCabe wrote triathlon into his social calendar in 2020, stayed stuck at a 5:45 for four years, and then decided to find out what would happen if he actually gave the sport what it was asking for. Two and a half years of consistent work later — including a build block that got replaced by 23,000-step days in Italy, a Zoltar fortune machine in a casino, and instructions from his coach that sca...

I see the following situation far too often: an athlete who is completely reliant on their devices, doesn’t practice their fueling, and cannot change a flat tire. This kind of reliance is deeply fragile: it doesn’t take much to break it on race day. In this show, I walk through the three most important skills to an endurance athlete’s success, and there are far more qualitative measures than quant...

This episode is a live recording from Campfire's annual Bend Triathlon Training Camp, where co-coach and longtime collaborator David Tilbury-Davis sat down with campers for an open Q&A. David has coached over 30 years and worked with some of the most recognized names in the sport — Lionel Sanders, Ashley Gentle, Cody Beals, Sky Munch, Kaisa Sali, and many others — but what runs through every a...

Simon Marshall trained the brains of endurance athletes for a living, and in this conversation he makes the case that the mental side of sport is the part most of us skip — right up until it costs us a race. Recorded during the pandemic and shared again in Simon's memory, the episode digs into what actually decides how race day goes: why everyone walks to the start line a little terrified, why you...

Swim improvement is slow, frustrating, and worth every minute — and this episode is proof of that. Chris walks you through Alex W.’s amazing 2:35 to 1:52/100 threshold pace improvement in today’s episode: what wasn’t working, what Chris prescribed, and how Alex took the reins and put in the hard work. We track her development step by step: the front quadrant breakdown that was costing her propulsi...

The difference between a well-trained bike-to-run transition and a poorly trained one is up to 10% of your run performance — and most athletes have no idea why it happens or what to do about it. In this episode, we look at four peer-reviewed studies on the physiology of brick runs, covering the nervous system disruption that starts before you even dismount, the fueling and breathing problems that...

Joe Friel — author of the Triathlete's Training Bible, co-founder of TrainingPeaks, and one of the most influential coaches in endurance sport — joins Chris Bagg for a conversation centered on durability: what it is, how it is built, and why it matters more than most athletes realize. Joe explains how he developed the concepts of heart rate decoupling and efficiency factor in the early 2000s — mor...

One of the issues with the established training zone systems out there is that, very often, there are more zones than we need, particularly for multisport training and racing. When zones were first established, most of the data came from road cyclists, who have more dynamic events and different demands placed upon them while competing. In a triathlon—even a short course triathlon—the goal is a ste...

Sports scientist and triathlete Tash Cooper-Smith from Precision Fuel & Hydration joins The Infirmary to demystify one of endurance sport's most confusing topics: fueling and hydration. Tash breaks down sweat testing, sodium concentration, carbohydrate intake, gut training, and the actual science behind cramping — and why the answer to most athletes' fueling problems is rarely as complicated a...

Most athletes swing between two bad options when things get hard: they back off because something in their brain, body, or heart says “too much,” or they panic, push too hard, and blow up. In this episode of The Infirmary we name the productive space between those two poles — the growth zone — and give you a practical tool to train your ability to stay there. Chris draws on his own racing career,...

Ryan Bolton is an Olympian, competing at the first Olympic Triathlon in 2000, and he is also a long course champ, winning Ironman Lake Placid in 2002. He coaches America’s top-ranked short-course triathlete, John Reed, and coaches or has coached Olympic Morgan Pearson, triathlon legend Ben Hoffman, recent star Sam Long, and many, many others. Ryan and I talk about a huge range of topics, including...

Coaches and athletes talk about the semi-mythical “flow state” a lot, but there is precious little information about how to achieve flow state. Those same coaches and athletes seem to leave it up to chance, but as you all (I hope) know, hope is not a strategy! In today’s episode, which is the companion piece to the guided meditation just below this one in the feed, we talk about ways to practice p...

The companion piece to Episode 40, this is is a guided meditation that will help you discover what your brain and body wants to do during a difficult interval or during a race. Practice this meditation to improve your ability to maintain a wide, soft, presence that improves your chances of accessing flow state in your training, racing, and life. Book a free training consult with Chris here : https...

Endurance coaching legend Gordo Byrn joins us to discuss his return to racing after a 10-year break. The 2002 Ultraman World Champion and author of From Lemon to Legend breaks down his training philosophy that led to a 9:03 at Challenge Roth. We explore why consistency matters more than any specific workout protocol, how he rebuilt his aerobic base starting with workouts so easy he didn't believe...

For well over the first half of my professional career, I was labeled an “emotional athlete.” That label seemed to mean, well, something else . In this case that “something else” appears to have been “undisciplined,” if the describer was being nice, or “riding like a stupid asshole,” if the describer wasn’t concerned with hurting my feelings. Faced with this description, which wasn’t ever really e...

David Tilbury-Davis coaches or has coached triathlon household names such as Ashleigh Gentile, Lionel Sanders, Skye Moench, Corinne Abraham, Cody Beals, and Matt Hanson, and he’s been doing so for three decades. In this episode, David explains his “evidence-led” in contrast to “evidence-based” approaches, how he gives athletes autonomy within structured training blocks, and why understanding your...

Overtraining syndrome is rare, serious, and can end your endurance career if you're not careful. In this episode, we break down the differences between functional overreaching (proper training), non-functional overreaching (under-recovery), and true overtraining syndrome (OTS, and again, it's really rare!). You'll learn the warning signs that separate temporary fatigue from something far more conc...

Canadian pro triathlete Cody Beals opens up about thoroughly burning out, wondering if his triathlon career was over after Ironman Chattanooga, and what happened when he took his first real break in over 25 years of school, athletics, work, and professional endurance sport. We discuss the difference between intellectual understanding and actual practice when it comes to rest, why so many endurance...

What if the most sophisticated training tool you have isn't your power meter, but your ability to feel the difference between sustainable and unsustainable effort? Kolie Moore launched Empirical Cycling in 2015 after noticing a gap in how coaches approached endurance training. With a background in biology, biochemistry, metabolism, and physiology from Boston University, plus his own experience as...

I am joined by professional triathlete and cyclist Rach McBride to review their 2025 season, which saw them shift focus from professional triathlon to Elite UCI Gravel World Championships qualifier. We chat about the realities of racing at the world championship level—the different (but sensible!) call-up system, competing independently against fully-supported national teams, and what it felt like...

“Zone 2” training has become incredibly popular in endurance sports, but most athletes misunderstand what it actually does and why it feels so frustratingly slow. In this episode, we debunk the misconceptions to explain how this training intensity establishes your aerobic infrastructure, why comparing yourself to professional athletes derails your progress, and how to embrace slow work now so you...