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Long runs, ultramarathon training, and fueling are at the heart of this all-time favorite episode, back by popular demand. Kristin Layne and Kyle break down how to actually build long run duration without breaking down — and why the biggest barrier to going long usually isn't fitness.

They cover the physiology and psychology of pushing into unfamiliar durations, why you should think in time rather than miles, and how to grow your long run gradually (a good rule of thumb: keeping it under about 30% of weekly volume). You'll learn why you don't need to run your full race distance in training, how back-to-back long runs build confidence and durability, and where RPE should sit so you're building fitness instead of digging a fatigue hole.

From dialing in 60–90g of carbs per hour and training your gut, to strength work for late-race durability, to mental tools like segmenting and telling the difference between uncomfortable and dangerous — this is a complete blueprint for stepping up to your first 50K, 50-miler, or 100. Give yourself the runway, and you can absolutely do it.

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How do you know if your training, supplements, or recovery hacks are actually working — or if you're just fooling yourself? Zoë and TJ break down the science of the N of 1 experiment and how to self-coach intelligently in a world flooded with biohacks, miracle protocols, and "this one weird trick" content. Borrowing Feynman's first principle — you must not fool yourself, and you are the easiest person to fool — they walk through six cognitive biases that trick endurance athletes into believing something works when it doesn't: regression to the mean, the placebo of the shiny new toy, confirmation bias, the novelty honeymoon, comparison traps, and sunk cost. Then they get practical: how to actually test an intervention, change one variable at a time, define success before you start, and ask the question that cuts through the noise — compared to what? Plus a coach spotlight on James Nance, TJ's road back to Leadville, and Zoë's day-by-day approach to managing an Achilles flare-up. If you've ever overhauled everything after one bad race or wondered whether your $80 ketones are doing anything at all, this one's for you. Reach out anytime: [email protected].

Check out the fuel tracking app here! FuelFlow

Running metrics, wearables, and training data get a reality check this week as Zoë and Kylee Van Horn cut through the noise of HRV scores, readiness ratings, and AI coaches to name the five numbers that actually move the needle in 2026. The episode opens with a familiar character: the athlete double-fisting a Whoop and a Garmin who hasn't strung four consistent weeks of training together in six months.

From there, the conversation breaks down what makes a metric genuinely useful, is it actionable, is the signal strong enough to act on, can you verify the underlying measurement, and does it tell you something your body isn't already saying? Then comes the countdown of the five that earn a spot on your watch: rate of perceived exertion (the master metric), consecutive weeks of consistent training, your 14-day sleep average, your long run as a percentage of your 30-day max, and carbohydrate intake per hour on long runs. Along the way: why one bad night of sleep won't break you, the 2025 research linking a single oversized long run to a 128% jump in injury risk, and why most runners fuel with far fewer carbs than they think they do. Evidence-based, occasionally unhinged, and a genuinely useful nudge to audit what you're actually tracking. Questions or hot takes? [email protected]

Running economy is one of the most misunderstood concepts in endurance training — and one of the most trainable. In this episode, Zoë Rom and TJ David break down what running economy actually is, why it matters more than VO2 max for marathoners and ultra runners, and the specific levers you can pull to get more output for the same input. Using the analogy of miles per gallon, they explain how two runners with identical VO2 max can run race times that differ by 20+ minutes — and what's going on under the hood to explain the gap.

The conversation covers the seven physiological factors that determine economy, from tendon stiffness and motor unit recruitment to substrate utilization and thermoregulation. Then they dig into the five interventions that actually move the needle: strength training, plyometrics, strides, hills, and consistent aerobic volume over time. Finally, they bust four of the most persistent running form myths — that you need to run 180 steps per minute, that mid-foot striking is automatically better, that super shoes are cheating, and that form drills will fix your mechanics.

If you're an intermediate runner who feels like you've plateaued despite logging the miles, this is the episode that explains what's missing. Plus a coach spotlight intro with Microcosm's Zachary Russell.

Hydration is one of the most overlooked levers in endurance performance — and one of the most punishing when you get it wrong. In this episode, Zoë and TJ unpack why dehydration is so much more than feeling thirsty, walking through the cascading downstream effects on your gut, your blood, your muscles, and ultimately your race result. They cover gut osmolality and why a too-concentrated drink mix actually pulls water the wrong way, the link between plasma volume drop and cardiac drift, and why dead legs late in an ultra often trace back to a sodium problem rather than a fitness one.

The conversation then turns to the practical side: how to DIY your sweat rate test at home, why your sweat sodium concentration is the number that changes everything, and which lab tests Zoë and dietician Kylee Van Horn actually recommend after testing six different options. They also break down why generic 300–800 mg per hour sodium guidance fails most athletes, with real roster examples ranging from 200 mg to over 2,300 mg per hour.

Before the hydration deep-dive, Zoë and TJ tackle a thoughtful listener question about the asides they sometimes make regarding endurance training and sexual health. They walk through the RED-S framework, what suppressed libido and menstrual dysfunction actually signal in athletes of all genders, and why these conversations belong in the coaching toolkit rather than as punchlines. Coach Kylee Van Horn at Fly Nutrition is mentioned as a go-to sports dietician for clinical questions.

If you've ever had a mystery DNF, persistent GI distress, or fallen apart late in a race for reasons you couldn't pin down, this is the episode to listen to twice.

Questions, topics, hot or nots: [email protected] Learn more: microcosm-coaching.com

This week we welcome you behind the scenes of Microcosm Coaching with a quick introduction to Coach Zachary Russell, an athletic trainer and strength coach whose multisport background spans Ironman, triathlon, marathoning, and trail running. He shares what kinds of athletes light him up to coach and how his experience across disciplines shapes the way he builds plans.

Then Zoë and TJ dig into TJ's recent Canyons Endurance Run 100K, which he completed roughly 80 minutes off his goal time after a brutal stretch of life context, including his dad's ongoing health and the loss of his uncle the night before the race. They talk about how Cliff and TJ restructured the build entirely, doing more base earlier and less intensity later, and yet Training Peaks read his fitness as identical to previous cycles. They get honest about caretaker stress, mental bandwidth, the choice to keep the door open to joy even when training feels heavy, and why the comparison trap between seasons can quietly steal everything.

The bulk of the episode tackles a listener question from Delaney, who has noticed the same faces at every ultra and is wondering whether stringing races together actually counts as training. Zoë and TJ define training the way Microcosm uses it, intentional movement with an adaptive purpose, and reframe it as a continuum rather than a binary. They unpack the B race concept, the difference between racing it and running it, the lily pad effect of bouncing race to race without ever integrating what you learned, and the diminishing returns of using events as a substitute for consistency. They also offer a few honest questions to ask yourself, including whether you would still be putting in this volume if nothing were on the calendar, and what it means to build a higher floor in the interstitial periods most runners ignore.

Have a question for the show? Email us at [email protected] and check out microcosmcoaching.com to learn more about working with our coaches.

Why does your running fitness plateau, and what can you actually do about it? Zoë and TJ break down the five real reasons endurance athletes get stuck, a lack of training intentionality, under-recovery, chronic under-fueling, a mismatch between training and event demands, and failing to apply progressive overload across more than one lever.

This episode also features a coach spotlight with James Nance, a Microcosm coach specializing in multi-sport athletes and RED-S recovery, TJ's mindset heading into race week at Canyons 100K, and a Reddit question on why your legs fall apart after your first 50K.

New to Microcosm? Roster spots are open — email [email protected] or visit microcosmcoaching.com.

Most runners follow a training plan. Very few understand the architecture behind why it's built the way it's built, and that gap is exactly where progress stalls.

This week, we break down the science of periodization: what it actually is, how to structure a full training year around it, and the most common mistakes that keep athletes stuck in the gray zone. We cover training intensity distribution (pyramidal vs. polarized vs. mixed), block versus concurrent periodization and what the research actually supports, the five phases of a well-built training year, and why your easy days are probably not easy enough. Zoë also shares what she's noticed firsthand after switching to a block-style approach in her own training, the good, the bad, and the PRs.

Before the main topic, we run through a Hot or Not triple-header: Nomeo broccoli sprout shots (real mechanism, no peer-reviewed human data yet), the Apex Narwhal palm cooling device (the Stanford science is interesting, the application for runners is not), and pelvic floor PT, which gets a full endorsement for every runner, regardless of gender or whether you've ever been pregnant.

New to Microcosm? We'd love to be your coaches. Reach us at [email protected] or visit microcosm-coaching.com.

Most runners ask one question before a race: did I finish my training plan? But fitness and race readiness are not the same thing — and in this episode, Zoë and TJ break down the physiological and psychological framework that actually tells you whether you're ready to toe the line.

They start with the foundational model: fitness + freshness + specificity. Using the Banister fitness-fatigue model, they explain how both signals decay at different rates (fatigue's half-life is roughly 7–10 days; fitness is 40–45) — and why that gap is exactly where your race-day performance capacity lives.

From there, they go sign by sign through five indicators you're ready — including aerobic decoupling and cardiac drift as readiness metrics, what glycogen supercompensation actually feels like during taper, why race-specific physiological systems (VO2max, lactate threshold, SGLT-1/GLUT-5 gut adaptation) can't be faked on race day, and how pre-race anxiety and pre-race arousal are the same physiological state with a different cognitive label.

Then the five signs you're not: climbing out of a fatigue hole your neuroendocrine system is still broadcasting, missing race-specific work that willpower can't replace, running on a pain you've been rationalizing, under-fueling and under-sleeping your way to the start line, and the hardest conversation in coaching — when your goal and your fitness aren't in the same zip code.

They also get into: Hot or Not on energy drinks at aid stations, AI-generated Spotify playlists vs. human curation, multi-day races and FKTs, and Prancercise (yes, really).

Topics covered:

• The Banister fitness-fatigue model and why fitness and freshness decay at different rates
• Aerobic decoupling (Pa:Hr) and cardiac drift as race readiness signals
• Training Stress Balance (TSB): what the +10 to +25 range actually means
• Glycogen supercompensation during taper — and why you should not get on a scale
• VO2max, lactate threshold, and time-on-feet: the specificity gap
• Gut training: SGLT-1 and GLUT-5 transporter adaptation, and why 12 weeks out is not too early
• Pre-race arousal vs. anxiety — the Alison Wood Brooks reappraisal research
• HPA axis dysregulation, HRV, and the neuroendocrine signals of a fatigue hole
• DOMS vs. injury-relevant pain — the checklist coaches actually use
• WIG, WAG, and WOG: cascading race goals and why rigid goals aren't ambitious

More at microcosm-coaching.com. Join the Foothills community for $10/month — group coaching, Slack community, and twice-monthly roundtables with Microcosm coaches.

Zoë and TJ are back from Italy and kicking off April with a packed episode. First up: coach Kyle Jones: a masters athlete and ultra running specialist with a focus on helping athletes who are all in on the long game, whether that's accumulating volume safely or solving the full puzzle of race-day logistics that go far beyond training.

Then it's Hot or Nots. On the docket: incline stretch boards for calf and Achilles work (the evidence is real, but eccentric loading beats passive stretching for most underlying issues), packaged Rice Krispie Treats as race fuel (the macros check out — 27 to 30 grams of carbs, glucose plus fructose, low fiber — but the chewability at mile 50 is another story), Ziploc bags in ice bandanas (hard pass: the evaporation is the whole point), hybrid athletes as a category (the jury is out, but the coaches aren't your girls if high rocks is your thing), run clubs (yes, with a firm caveat on effort), and microdosing during ultras (the research case for decriminalization is strong; the research case for running 100 miles on psilocybin is still pending).

The listener Q this week tackles one of the most common rules in running: you don't need to fuel for efforts under 90 minutes. Zoë and TJ break down why that's only half the story. There are actually two separate mechanisms at play — the metabolic pathway most runners know, and a neurological pathway most don't. Receptors in the mouth and upper GI tract signal the brain the moment carbohydrates are detected, easing the protective fatigue response before a single calorie has been absorbed. This has been demonstrated even when athletes swish a carb solution and spit it out. For high-intensity efforts like a hard half marathon, the case for fueling is stronger than the 90-minute rule suggests — and the practical takeaways are in the episode.

The back half is a full race debrief on Chianti. Zoë ran an hour faster than last year and still came in 13th. TJ walks through how to approach a post-race analysis when the headline result doesn't tell the full story — and how Zoë's coach surfaced a key data point she almost missed entirely: cardiac drift. In 2025, Zoë's cardiac drift was 9.54% over the course of the race. In 2026, it was negative 1.39%, meaning she was actually able to access higher heart rates at the end of the race — a direct signal of aerobic durability built by keeping easy days genuinely easy, week after week. The conversation covers what cardiac drift actually measures, why gray zone training works against this adaptation, and what the terrain-specific limiter was that explains the placement gap.