Metabolic Mastery

Episodes

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  Ep. 76: Heart Rate Zones Explained: Why Zone 2 Means Different Things to Everyone 20.10.2026 1h 14m

  Get A Demo: https://korr.com/contact/video-demo/Heart rate zones might be the most misunderstood concept in fitness — and in this episode of Metabolic Mastery, hosts Dr. Marc Humbert and Dr. Cameron Garber take a deep dive into exactly why. From elite Olympic athletes using completely different zone systems to say the same thing, to the century-old misunderstanding behind "anaerobic threshold," they break down how heart rate zones are actually derived, why physiology is a continuum rather than an on/off switch, and how to use testing data (not guesswork or wearable estimates) to train for the adaptations that actually matter.You Will Learn:Why "zone 2" means something completely different depending on whether you're using a 3-zone, 4-zone, or 5-zone system — and why that causes so much confusion onlineThe real story behind "aerobic" and "anaerobic" thresholds, and why lactate is actually produced continuously, even aerobicallyWhy percentage-based zoning (like 220-minus-age or % of VO2 max) can lead to large individual errors compared to physiology-based zoningWhy wearable VO2 max estimates are a "prediction of a prediction" and can mislead you about your actual fitnessWhy zone 3 is often "the no-progress zone" — hard enough to require recovery, but not hard enough to drive real adaptationThe specific physiological adaptations happening in each zone: capillarization and mitochondrial density in zone 1-2, cardiac output improvements, and top-end power and mitochondrial efficiency in zones 4-5Why consistency (not intensity) is the real driver of long-term change, and how training every day — even lightly — beats sporadic hard effortsThe difference between performance and resilience, and why "surviving" a training program doesn't mean it was optimalHow to use RPE, pace, and power as anchors to your heart rate zones for better self-awareness and auto-regulation
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  Ep. 74 - Daniel Crumback: The Zoning Mistake: Why Your Heart Rate Zones May Be Wrong 06.10.2026 53m

  Get Daniel's PTAP Course: https://strategichealthperformance.inspire360.com/p/ptap-foundationsGet A Demo: https://korr.com/contact/video-demo/Most people buying a metabolic analyzer have no idea how much data they're leaving on the table. In this episode of Metabolic Mastery, hosts Dr. Marc Humbert and Dr. Cameron Garber sit down with Daniel Crumback, KORR's Director of International Sales and a certified exercise physiologist, chartered physiotherapist, and strength and conditioning specialist with 30 years of testing experience, to break down how to get the absolute most out of your cardio coach.They cover why VO2 max alone only tells half the story, the hidden difference between metabolic and ventilatory zoning methods, the testing mistakes that quietly wreck your data, and why retesting (not just testing) is where the real transformation happens.You Will Learn:Why VO2 max is just "the sexy thing to sell", and what data actually drives real programming decisionsThe critical difference between metabolic (RER-based) and ventilatory (VE/VO2, VE/VCO2) zoning methods, and why they can produce zones 20-30 beats apartHow to identify a client's true physiological limiter (cardiovascular, respiratory, or metabolic) and zone accordinglyWhy "peak" and "max" aren't the same thing, and how missing a true max (RER of 1.15+) leaves critical zone-five data off the tableThe proper testing protocol: a 5-minute low-intensity warm-up, correctly sized increments, and tests lasting 9-12 minutesWhy RMR and VO2 max testing should never be done in isolation from each otherHow VO2 pulse and peak VO2/breathing frequency can reveal undiagnosed cardiac and respiratory issuesWhy retesting, not a one-and-done test, is what truly drives client retention and long-term resultsHow mismatched fat/carb utilization at rest vs. during exercise points directly to nutrition issues
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  Ep. 75 - Dr. Craig Broeder: The Metabolic Cart Secrets: Why Most Devices Get It Wrong 13.10.2026 1h 35m

  Get A Demo: https://korr.com/contact/video-demo/Dr. Craig Broeder has spent 45 years at the top of exercise physiology and metabolic testing, training under legends like Jack Wilmore, David Costill, and George Brooks, running biopsy-heavy research trials, and leading elite performance projects for Red Bull's world-class athletes.In this episode of Metabolic Mastery, hosts Dr. Marc Humbert and Dr. Cameron Garber sit down with Dr. Broeder to unpack decades of hard-won lessons on what separates accurate metabolic testing from guesswork, from calibration pitfalls to genetic limits on VO2 max, and why so many popular fitness devices get it dangerously wrong.You Will Learn:How Dr. Broeder's path from professional musician to exercise physiologist began, and the mentors (Wilmore, Costill, Ivy, Coyle) who shaped his careerWhy mixing chamber, breath-by-breath, and mini mixing chamber metabolic systems each have unique strengths and blind spotsThe real-world calibration mistakes (temperature, humidity, drying lines) that silently corrupt test dataShocking accuracy findings from a published Cardio Coach validation study — including one popular consumer system with error rates up to 16.9%Inside the Heritage Project: what large-scale genetic research reveals about how much of your VO2 max improvement is really genetics vs. trainingBehind-the-scenes stories from Red Bull's altitude performance research with elite cyclists and runnersWhy knowing a client's history, goals, and psychological comfort with testing is just as important as the protocol itselfHow Dr. Broeder used metabolic testing to help a client recover from a severely underfed metabolism (800 to 1,290 calories) without weight-loss drugs
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  Ep. 72 - How to Warm Up Clients for Accurate VO2 Max & Metabolic Testing 22.09.2026 50m

  Get A Demo: https://korr.com/contact/video-demo/Should every client do a warm-up before a VO2 max test? In this episode of Metabolic Mastery, Dr. Marc Humbert and Dr. Cameron Garber tackle a question that's surprisingly underexplored in the exercise science literature: how to properly warm up a client before metabolic testing.They break down the three main purposes of a warm-up — transition, familiarization, and priming — and introduce their practical R.E.A.D.Y. framework to help practitioners decide exactly how much (or how little) warm-up a given client needs. From elite athletes to deconditioned beginners, from ramp protocols to fat max testing, Marc and Cameron walk through real-world scenarios, mask familiarization tips, and how to use heart rate as a readiness indicator before you ever hit "start" on the test.You Will Learn:The three primary purposes of a warm-up: transition, familiarization, and primingWhy "it depends" is the right answer for whether a client needs a warm-upThe R.E.A.D.Y. framework: Reason, Estimate, Acclimate, Dose, and confirming they're readyHow to use heart rate stability as a signal that a client is ready to begin testingWhy building the warm-up into the protocol can save time without sacrificing data qualityTips for helping clients get comfortable with the mask and equipment before testing startsHow to document warm-up protocols in Cardio Coach software for consistent repeat testingWhen elite athletes need a separate warm-up vs. when to skip it for deconditioned clients
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  Ep. 73-Dr.Thomas George: The Doctor Who Lost 120 Pounds:Inside the Science of Adaptive Thermogenesis 29.09.2026 1h 12m

  Get A Demo: https://korr.com/contact/video-demo/Dr. Thomas George didn't set out to become an obesity medicine specialist — a traumatic brain injury and a 120-pound weight gain got him there. In this episode of Metabolic Mastery, Dr. Mark Humbert and Dr. Cameron Garber sit down with Dr. George, founder of Wellspring Weight and Wellness, to unpack the science and story behind sustainable weight management.Dr. George shares his own journey from competitive martial artist to 330 pounds and back, and how a neuroendocrinologist's diagnosis changed the way he sees — and treats — obesity. The conversation dives deep into adipocyte biology, why "it's not about the weight," the real data behind adaptive thermogenesis, and why so many patients on GLP-1 medications still hit frustrating plateaus.You Will Learn:Why obesity is best understood as a "disease of diseases" and what that means for treatmentHow the personal fat threshold and adipocyte hypertrophy drive metabolic dysfunctionWhat resting energy expenditure testing reveals about adaptive thermogenesis — and why its effects can persist up to six yearsWhy GLP-1/GIP medications don't fix metabolism on their own, and what's missing from many prescribing plansHow building metabolically healthy muscle protects against weight regain and sarcopeniaWhy exercise matters more for maintenance than for initial weight lossHow cultural food patterns (Mediterranean, Inuit, Hispanic heritage diets) inform sustainable eatingWhy calorie quality, density, and dosage matter more than any single "diet"Subscribe: https://www.youtube.com/@korrmed
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  Ep. 70 - Part 2: How to Design the Perfect HIIT Workout (Using Real VO2 Max Data) 08.09.2026 59m

  Get A Demo: https://korr.com/contact/video-demo/In part two of this two-part series, Metabolic Mastery hosts Dr. Marc Humbert and Dr. Cameron Garber shift gears from low intensity training to high intensity — breaking down exactly what HIIT does physiologically, why it works, and how to design intervals that actually match your goals.They start by revisiting the "three zone" model (comfortable, comfortably uncomfortable, and uncomfortable) and explain why moderate intensity — the "no progress zone" — often doesn't drive much adaptation for people who already live there. From there, they dig into the real benefits of high intensity work: rapid VO2 max improvements, stronger cardiovascular pumping, better lactate shuttling, and improved top-end speed and power.A major focus of this episode is debunking the lactic acid myth — lactate isn't a waste product causing muscle burn, it's a valuable fuel source, and understanding how it's produced, transported, and used is key to designing smarter workouts. Marc and Cameron also walk through the "three dials" (oxidative, glycolytic, neuromuscular) and "three clocks" (time under load, interval length, recovery time) framework for designing HIIT workouts with intention — plus why heart rate alone isn't a reliable guide at high intensities, and how VO2 max testing data can pinpoint the exact speed or power to target for real adaptation.You Will Learn:The difference between "comfortable," "comfortably uncomfortable," and "uncomfortable" training zones — and why the middle zone often delivers the least returnWhy lactate is a fuel source, not a fatigue-causing waste product — and how the body actually clears and uses itThe real benefits of high intensity interval training, including rapid VO2 max gains and improved mitochondrial efficiencyHow to use the "three dials" (oxidative, glycolytic, neuromuscular) to design intervals for specific adaptationsWhy heart rate lags at high intensity and why speed/power targets (from VO2 max testing) are more reliableHow interval length and recovery time change which energy systems you're actually trainingWhy "short term hard, long term easy" beats chasing quick fixes when it comes to fitness and healthHow to avoid junk volume by matching your training to your actual physiology instead of generic templatesThe difference between HIIT-style intervals and longer threshold work — and when to use each
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  Ep. 71 - Jody Nelson: Why "Healthy" Habits Aren't Working: A Postpartum VO2 Max Case Study 15.09.2026 49m

  Get A Demo: https://korr.com/contact/video-demo/On this episode of Metabolic Mastery, hosts Dr. Marc Humbert and Dr. Cameron Garber are joined by Jody Nelson — KORR's resident metabolic testing expert with a decade of experience and a degree in exercise science — to break down a real client case study.The client: an otherwise fit woman, 18 months postpartum, doing everything "right" — solid nutrition, consistent low-intensity walking — yet stuck in a frustrating weight loss plateau. Her VO2 max test revealed something unexpected: a surprisingly narrow fat-burning zone, a rapid heart rate spike when transitioning from walking to running, and a respiratory pattern that told a much bigger story than the numbers alone.Marc, Cameron, and Jody walk through the respiratory rate and tidal volume graphs in real time, showing how early-test hyperventilation and anxiety can skew substrate utilization data — and why the device is almost never "wrong." They dig into the difference between being fit and being healthy, why perceived exertion is an unreliable guide, and how major hormonal shifts (postpartum, pregnancy, menopause) can scramble a client's ability to accurately read their own body.You Will Learn:Why a narrow fat-burning zone doesn't always mean poor metabolic health — and what else could be going onHow to read respiratory rate and tidal volume graphs to spot hyperventilation and test anxietyWhy "the device is broken" is almost never the right conclusion when a test result looks unusualThe critical difference between being cardiovascularly fit and being metabolically/physically healthyWhy perceived exertion is an unreliable training guide and how heart rate data corrects itHow hormonal changes during postpartum, pregnancy, and menopause affect metabolic test resultsWhy testing what you intend to measure (and training for the adaptations you want) mattersHow to ask better follow-up questions instead of jumping to blood work or invasive testingWhy "fit" doesn't always mean "healthy" — and what that means for injury risk and longevity
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  Ep. 70 - Part 1: The Best Workout Doesn’t Exist Here’s What Works Instead 01.09.2026 54m

  Get A Demo:https://korr.com/contact/video-demo/Is Zone 2 training the answer or should you spend your limited workout time doing high-intensity intervals? The research can make almost any popular workout sound like the best option, but that advice often overlooks the most important variable: the individual doing the training.In this episode of Metabolic Mastery, Dr. Marc Humbert and Dr. Cameron Garber explain why effective exercise prescription begins with your goals, physiology, injury history, available time, recovery capacity, and current fitness. They break down how the body’s energy systems work together, why heart rate zone terminology creates confusion, and how social media can turn narrow research findings into sweeping recommendations.You’ll also learn how frequency, duration, and intensity shape an effective training plan; why progressive overload must be balanced with recovery; and what low-intensity exercise uniquely contributes to aerobic capacity, mitochondrial function, and consistency. Marc and Cameron also discuss how metabolic testing with CardioCoach can provide individualized data for selecting the training methods most relevant to a person’s needs.The goal is not to choose the winning exercise camp. It is to find the right combination—and the right dose—for the person in front of you.What You Will LearnWhy there is no single best workout for every person or goalHow goals, time, recovery, and injury history influence exercise selectionWhy the body’s energy systems behave more like dials than switchesWhat different heart rate zone models mean when they refer to “Zone 2”How social media can overgeneralize narrowly focused exercise researchWhy frequency and duration often matter before increasing intensityHow progressive overload drives adaptation—and when training becomes too muchWhat low-intensity exercise does for aerobic metabolism and mitochondrial functionWhy moderate-intensity training may produce fewer new adaptations for some peopleHow metabolic testing can support a more personalized exercise prescriptionChapters00:00 Is there a best workout?02:23 Why popular workouts become universal recommendations04:45 Building a personalized exercise prescription07:00 Energy systems work together09:28 How the body uses different fuels11:55 Matching energy systems to your goals14:18 Why “Zone 2” can mean different things16:34 What HIIT research does—and does not—tell us18:55 Frequency, duration, and intensity21:19 How your training history changes your starting point23:36 Looking beyond fitness advice on social media26:02 Adapting exercise to individual limitations30:43 Treating exercise like a precise prescription32:59 Specific adaptation and progressive overload35:08 Finding the right training dose37:31 The benefits of low-intensity exercise39:49 Volume, adaptation, and injury risk42:08 Balancing training stimulus with recovery44:34 The limitations of moderate-intensity training46:59 Choosing intensity based on time and goals49:23 Progressing from walking to higher intensity51:49 Using individualized data to guide training54:11 Stop choosing camps and start choosing the right dose
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  Ep. 69 - Rethinking Calories & Metabolism with Dr. Carol Ireton Jones 25.08.2026 1h 26m

  Get A Demo: https://korr.com/contact/video-demo/The conversation begins with an introduction and background, followed by a discussion of Carol Ireton-Jones's career journey and development. The conversation then delves into research and mentorship, followed by a focus on nutrition and dietary practices. Finally, the discussion explores the concept of food as fuel and satisfaction. The conversation covers the impact of environment on food choices, the role of nutrition in GI health, and the process of creating educational resources for dietitians. It emphasizes the importance of understanding individual health history, financial constraints, and the influence of supermarket environments on food choices. Additionally, it explores the management of GI symptoms, the impact of GI disorders on quality of life, and the role of psychology in GI health. The conversation also delves into the process of creating textbooks and the impact of academic and clinical books on nutrition and GI health. The conversation covered the importance of expertise and nuance in health and nutrition, the value of admitting uncertainty, myths and misinformation in nutrition, challenges of weight loss medications, and how to connect with the expert. The discussion emphasized the need for a multidisciplinary approach to weight loss and the impact of misinformation on health and quality of life.TakeawaysCareer development in nutrition and dieteticsImportance of research and mentorship in the fieldUnderstanding food as fuel and satisfaction Understanding the influence of environment on food choicesThe role of nutrition in managing GI health Admitting uncertainty earns trust and respectIndividualized dietary recommendations are crucial for healthA multidisciplinary approach is essential for sustainable weight lossChapters00:00 Introduction and Background05:22 Career Journey and Development13:15 Research and Mentorship20:31 Nutrition and Dietary Practices27:26 Food as Fuel and Satisfaction29:55 The Impact of Environment on Food Choices36:31 Nutrition and GI Health52:47 Creating Educational Resources for Dietitians01:01:40 Expertise and Nuance in Health and Nutrition01:06:01 The Importance of Admitting Uncertainty01:13:20 Myths and Misinformation in Nutrition01:25:33 Challenges of Weight Loss Medications01:30:01 Connecting with the Expert
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  Ep. 68 - Muscle Fiber Types & Training: How to Trigger the Right Adaptations for Your Goals 18.08.2026 47m

  Get A Demo: https://korr.com/contact/video-demo/Ever wonder what's actually changing in your body when VO2 max stays flat but your performance improves? In this episode, we break down the hidden adaptations happening at the biochemical, cellular, and tissue levels—and why patience with your training matters more than you think.We dive deep into energy systems (phosphocreatine, glycolytic, and oxidative pathways), explore how different muscle fiber types adapt to training stress, and reveal why rest intervals between workouts can completely change your results. Plus, discover why central fatigue, sleep, and nutrition are often the real limiting factors in your performance.You Will Learn:What metabolic changes occur BEFORE you see improvements in VO2 maxHow the three energy systems work and which training style targets each oneWhy rest intervals between sets determine whether you build endurance or powerThe critical role of muscle fiber type adaptations in athletic performanceHow sleep deprivation can sabotage your training adaptations (even when everything else is perfect)Why your training plateau might actually be a lifestyle factor, not a programming issueThe difference between peripheral fatigue and central nervous system fatigueHow to individualize training based on your unique physiology and constraintsThe importance of metabolic testing beyond just VO2 max numbersPractical frameworks for designing training that actually produces results
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  Ep. 67 - The 6 Pillars of Health: Reverse Aging Without Extreme Exercise 11.08.2026 56m

  Get A Demo: https://korr.com/contact/video-demo/Is maintenance really possible, or is it a lie? In this episode, we debunk the myth that doing the same fitness routine forever keeps you healthy. Discover why progressive overload matters more than you think, and how the SAID principle (specific adaptation to imposed demands) explains why your body adapts—or declines—based on the demands you place on it.We explore the six pillars of sustainable health, real-world examples of staying young at 90+, and why metabolic testing is your crystal ball for future fitness. Learn how to design a maintenance program that actually works, prevent the 10% VO2 max decline per decade, and combat muscle loss with actionable strategies.You Will Learn:Why "maintenance" requires continuous progression, not repetitionHow the SAID principle drives aging and fitness adaptationsThe six pillars of health and how to optimize each oneReal data: VO2 max, muscle mass, and metabolic rate changes with ageWhy activity levels matter more than genetics for longevityHow metabolic testing reveals your fitness future and prevents burnoutPractical strategies to stay active across all life stagesWhy your 93-year-old neighbor stays younger than people half his age
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  Ep. 66 - VO2 Max vs VLAMax: The Missing Piece in Your Training Program with Sebastian Weber 04.08.2026 57m

  Learn More From Sebastian: inscyd.comGet A Demo: https://korr.com/contact/video-demo/Join hosts Dr. Marc Humbert and Dr. Cameron Garber as we explore advanced metabolic testing, energy systems training, and performance optimization with industry-leading experts.In this episode, we dive deep into energy metabolism with Sebastian Weber, founder of Inside and renowned sports scientist. Discover why your current training zones might be limiting your progress, how lactate testing reveals hidden training insights, and the practical applications that separate elite athletes from everyone else.You Will Learn:Why standardized training zones fail (and what actually works)The difference between VO2 Max and VLAMax — and why both matterHow lactate production and clearance determine race strategyMuscle fiber recruitment patterns and why you can't neglect glycolytic powerReal case studies: Programming for HyROX athletes, cyclists, and endurance performersThe truth about fasted training, periodization, and training variationHow metabolic data creates a "crystal ball" into what athletes have been doingWhy understanding the mechanism behind training beats following trendsPerfect for coaches, athletes, fitness professionals, and anyone serious about optimizing performance through science.
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  Ep. 64 - The VO2 Revolution in Performance & Longevity with Stephen Olson of Benchmark Body Metrics 21.07.2026 1h

  Follow Stephen:Instagram: _stephenolsonGet A Demo: https://korr.com/contact/video-demo/In this episode, Cameron Garber dives deep into metabolic testing with Stephen Olson, founder of Benchmark Body Metrics. Discover why your smartwatch's VO2 estimate might be 20% off, how to build an aerobic base that transforms endurance performance, and the often-overlooked breathing patterns that limit fitness gains.From testing Everest summiteers to diagnosing why runners plateau despite consistent training, Stephen reveals the clinical secrets that separate generic fitness advice from data-driven results.You Will Learn:Why VO2 max correlates with longevity (and what it actually means)The 3 metabolic testing methods that replace guesswork in your training programHow to identify your true fat-burning zone—without an expensive deviceThe respiratory limitation that cost one Boston Marathon qualifier 2 years of progressWhy testing yourself 200+ times is the fastest path to coaching masteryHow to use metabolic data to sell premium coaching packages (business angle)The fat oxidation graph that makes clients immediately "get" their training zonesWhy 95% of people will choose premium packages when you show them this data first
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  Ep. 65 - Is VO2 Max Testing Just a Fitness Fad? (The Truth) 28.07.2026 1h 6m

  Get A Demo: https://korr.com/contact/video-demo/Is VO2 max testing the real deal, or is it just another fitness fad riding a social media wave? In this episode of Metabolic Mastery, Dr. Marc Humbert and Dr. Cameron Garber pull from their "Fitness Fad Decoder" framework 10 practical questions anyone can use to separate real, sustainable science from hype and apply them directly to VO2 max testing, zone training, and cardiopulmonary exercise testing (CPET).They break down why VO2 max is a powerful, well-validated number, but a dangerous one to chase in isolation and what actually determines whether VO2 max testing will help you build lasting fitness or just become this decade's fleeting trend.You Will Learn:The 10-question "Fitness Fad Decoder" framework for evaluating any health or fitness trendWhy VO2 max is a great indicator of fitness but not a complete picture of health or longevityThe difference between population-based heart rate zones and physiology-based training zonesWhy chasing a single VO2 max score can actually increase injury and burnout riskHow fat oxidation (fat-burn zone) differs from fat loss — and why the two get confusedWhat determines whether high-intensity training like the Norwegian 4x4 is right for you right nowHow symptom-limited and submaximal testing can safely inform training for nearly any populationWhy cardiovascular reserve and muscle mass both matter for long-term health, not just VO2 maxHow to evaluate research claims and identify influencer overclaims around fitness trendsWhy investing in accurate metabolic testing may be one of the highest-ROI decisions for your health or your practice
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  Ep. 63 - Why Your Smartwatch's VO2 Max Is Wrong With Daniel Crumback 14.07.2026 1h 10m

  Get A Demo: https://korr.com/contact/video-demo/Wearables and influencers have made VO2 max a household term but most of what's being said about it is misleading, oversimplified, or flat-out wrong. In this episode, Dr. Marc Humbert sits down with Daniel Crumback Director of International Sales at KORR, certified exercise physiologist, chartered physiotherapist, and strength and conditioning specialist to cut through the noise around VO2 max, zone training, and metabolic testing.Daniel breaks down why devices measuring O2 only can't actually calculate a true VO2 max, why a high VO2 max doesn't mean someone is metabolically healthy, and how misapplied protocols like the Norwegian 4x4 can do more harm than good when they ignore an individual's actual limiters. Using a real case study a high-performing executive whose cardiovascular numbers looked great but whose metabolic health was quietly falling apart Daniel shows why testing without proper analysis is nearly worthless.You Will Learn:Why VO2 max and VO2 peak are not the same thing, and why that distinction mattersWhy O2-only devices can't truly measure VO2 max (and what gets lost in the algorithm)How to identify which system — cardiovascular, respiratory, or metabolic — is actually limiting performanceWhy "zone two" and "zone five" training aren't competing philosophies but serve different physiological purposesWhat near-infrared spectroscopy (NIRS) can and can't tell you about performanceWhy lactate testing has real limits — and where marketing claims cross into dishonestyHow AI-generated fitness advice can sound convincing while being physiologically inaccurateWhy testing to the modality (rather than testing to find true limitations) leads to bad programmingHow proper zoning through metabolic testing can prevent long-term issues like metabolic diseaseWhat separates a trustworthy fitness expert from an untrustworthy one (hint: they say "it depends")
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  Ep. 61 - Why Research Alone Can't Save You: Applying Science to YOUR Body (N of 1 Explained) 30.06.2026 1h 8m

  Get A Demo: https://korr.com/contact/video-demo/ In this episode of Metabolic Mastery, hosts Dr. Marc Humbert and Dr. Cameron Garber tackle one of the most misunderstood challenges in health and fitness: how to take population-based research and actually apply it to the individual in front of you — the "N of 1." With an overwhelming flood of new studies published daily, it's easy to either over-rely on research or dismiss it entirely. Marc and Cameron walk through a practical framework for reading research critically, understanding study design, and using metabolic testing data — including VO2 max and resting metabolic rate — to personalize care and training in the real world.You Will Learn:What "N of 1" means and why it matters for your health and trainingHow to evaluate research quality, including study design, population relevance, and statistical vs. clinical significanceWhy your VO2 max or RMR result may look "normal" but still be telling an important story about your individual trajectoryThe difference between a research roadmap and a blueprint — and how to stop confusing the twoHow Bayesian reasoning can help you update your beliefs without flip-flopping on every new studyWhy placebo effect, natural disease history, and confirmation bias can fool even experienced cliniciansHow the "evidence-based medicine funnel" works: best available research → clinical expertise → individual goals and constraintsReal examples of how metabolic testing reveals outliers that population averages would completely missWhy effect size matters just as much as statistical significance when evaluating any interventionHow to run your own mini N of 1 experiments over time using repeat metabolic testingFollow KORR:Instagram: https://www.instagram.com/korrmedical/ Facebook: https://www.facebook.com/korrmedical/ LinkedIn: https://www.linkedin.com/company/korrmedicalhttps://korr.com/ Listen to the Metabolic Mastery Podcast:Apple Podcast: https://podcasts.apple.com/us/podcast/metabolic-mastery/id1812972674 Spotify: https://open.spotify.com/show/2sgLMFv1Z8DwEz87yUpapI?si=29a177a6c6ca4ed4 YouTube: https://www.youtube.com/@korrmed/podcasts YouTube Music: https://music.youtube.com/playlist?list=PLVCRWXBDdFo_S0OeaAsPv8xTnfajTLc75&si=d4wVUA0jqajkbukB Amazon: https://music.amazon.com/podcasts/d76834b7-c11a-485f-8010-32b490d49e57/metabolic-mastery
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  Ep. 62 - How We Helped a Injured Runner Lose 20 Lbs Without a Weight Loss Program (Real Case Study) 07.07.2026 1h 11m

  In this episode of Metabolic Mastery, Dr. Marc Humbert and Dr. Cameron Garber walk through a real-world case study of a female runner in her 40s one who was stuck in a cycle of injuries, told to stop running, and struggling to lose weight despite years of effort. Using resting metabolic rate (RMR) testing, VO2 max data, and evidence-based exercise prescription, they break down exactly how they designed a program focused on injury prevention and performance, and how weight loss followed naturally as a byproduct.You Will Learn:Why telling injured runners to "rest it away" creates a vicious cycle that destroys tissue capacity over timeHow RMR data revealed this client preserved muscle mass during 12%+ body weight lossWhy metabolic adaptation causes RMR to drop 5–30% beyond what fat loss alone explains and how to track itThe load vs. capacity framework that allowed this client to run every single day for a year injury-freeHow Zone 2 training reduced injury risk while actually improving race paces at age 41Why adherence not the "optimal" program is the single biggest predictor of weight loss successHow protein intake (1.6g/kg) and resistance training protect fat-free mass during weight lossThe danger of false dichotomies in fitness (HIIT vs. Zone 2, cardio vs. strength) and why both are neededWhy bone stress injuries are usually an under-fueling problem, not an overuse problemHow to use metabolic retesting to iterate your coaching when results aren't going as expected
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  Ep. 29 - DEXA Scans, GLP-1s, and Longevity With Special Guest Tony Orlando 18.11.2025 44m

  In this episode of Metabolic Mastery, Dr. Marc Humbert and Dr. Cameron Garber sit down with Tony Orlando, founder of Dexa Plus and DexaScan.com, to unpack why DEXA scans are becoming one of the top longevity markers. They explore how DEXA goes far beyond a simple "body fat test," revealing bone density, muscle distribution, and visceral fat levels that directly impact long-term health, performance, and fracture risk. Tony explains why waiting until insurance finally covers a scan at age 65 or 70 is often too late, and how early, recurring testing—paired with VO₂ max and RMR—can completely change the trajectory of your health. The conversation also dives into GLP-1 medications, hidden muscle and bone loss, youth osteopenia, and how to choose a provider who doesn't just hand you a report, but actually gives you a plan. What You'll Learn What a DEXA scan actually measures (bone, muscle, and fat) and why it matters Why DEXA is a powerful longevity marker, not just a "fitness gadget" How visceral fat drives heart disease and type 2 diabetes risk The dangers of rapid GLP-1–driven weight loss without preserving muscle Why osteoporosis is a silent disease affecting younger adults than you think The critical bone-building window between ages 8–28 How strength training supports bone density for both men and women Why quarterly DEXA, VO₂ max, and RMR testing can guide long-term progress How to interpret body fat percentages realistically (not bodybuilding fantasies) What to look for in a high-quality DEXA provider and how DexaScan.com helps Get A Demo: https://korr.com/contact/video-demo/   Follow KORR: Instagram: https://www.instagram.com/korrmedical/  Facebook: https://www.facebook.com/korrmedical/  LinkedIn: https://www.linkedin.com/company/korrmedical https://korr.com/  Listen to the Metabolic Mastery Podcast: Apple Podcast: https://podcasts.apple.com/us/podcast/metabolic-mastery/id1812972674  Spotify: https://open.spotify.com/show/2sgLMFv1Z8DwEz87yUpapI?si=29a177a6c6ca4ed4  YouTube: https://www.youtube.com/@korrmed/podcasts  YouTube Music: https://music.youtube.com/playlist?list=PLVCRWXBDdFo_S0OeaAsPv8xTnfajTLc75&si=d4wVUA0jqajkbukB  Amazon: https://music.amazon.com/podcasts/d76834b7-c11a-485f-8010-32b490d49e57/metabolic-mastery  
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  Ep. 25 - Why "Easier" Training Makes You Faster (and Injury-Free) Wtih Chris Navin 21.10.2025 1h 15m

  Follow Chris Navin: Instagram: https://www.instagram.com/4starendurance Facebook: http://fb.com/metabolicathlete Linkedin: https://www.linkedin.com/company/4starendurance YouTube: https://www.youtube.com/@4starendurance www.4starendurance.com/coach-chris Coach Chris Navin—triathlon & marathon coach, 400+ races, 50+ Iron-distance finishes, Team USA qualifier 25+ times—joins Dr. Marc Humbert and Dr. Cameron Garber to unpack how metabolic profiling turns guesswork into PRs. Chris shares his unlikely journey from certified ethical hacker to endurance coach, why most athletes train a little too hard and fuel a little too little, and how VO₂ testing (O₂ and CO₂) lets you individualize zones, nail fueling, avoid injuries, and even negative split your marathon. We dig into "level 1 vs. level 2" testing, long-form testing with CardioCoach™, zone-2 misconceptions, fat-max shifts, and Chris's Four-Star Endurance method (Plan, Test, Learn, Inspire) that helps everyday athletes perform like pros—often improving VO₂ max and race times with age. What you'll learn How to read a metabolic profile (fat/carb crossover, thresholds, fat-max) and turn it into training zones Why running "easier" can make you faster (and lighter) on race day The difference between level 1 (baseline VO₂ + zones) and level 2 (fueling-focused, event-specific) tests Evidence-based fueling math for marathons and Iron-distance events (and why most bonk near mile ~18–20) A simple rule to prevent injuries: don't raise volume and intensity at the same time How to use devices/apps (Garmin, Connect IQ, Myzone) after you calibrate them with lab data The Four-Star Endurance framework to keep athletes motivated long-term Follow KORR: Instagram: https://www.instagram.com/korrmedical/  Facebook: https://www.facebook.com/korrmedical/  LinkedIn: https://www.linkedin.com/company/korrmedical https://korr.com/  Listen to the Metabolic Mastery Podcast: Apple Podcast: https://podcasts.apple.com/us/podcast/metabolic-mastery/id1812972674  Spotify: https://open.spotify.com/show/2sgLMFv1Z8DwEz87yUpapI?si=29a177a6c6ca4ed4  YouTube: https://www.youtube.com/@korrmed/podcasts  YouTube Music: https://music.youtube.com/playlist?list=PLVCRWXBDdFo_S0OeaAsPv8xTnfajTLc75&si=d4wVUA0jqajkbukB  Amazon: https://music.amazon.com/podcasts/d76834b7-c11a-485f-8010-32b490d49e57/metabolic-mastery
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  Ep. 23 - How to Find Your True Zone 2 (and Why Most Apps Get It Wrong) 07.10.2025 1h 11m

  Schedule A Demo: https://korr.com/contact/video-demo/ "Zone 2" is everywhere—but are we even talking about the same thing? Dr. Marl Humbert and Dr. Cameron Garber sit down with performance physiologist Daniel Crumback to cut through the noise and reframe training zones around what actually matters: ATP production and substrate use. Instead of leaning on arbitrary percentages of HRmax or VO₂max—or single-point lactate snapshots—they unpack how real-time O₂ and CO₂ data reveals where your metabolism shifts, why inflection points beat "crossover" shortcuts, and how to translate those shifts into smarter prescriptions for everyday athletes, patients, and pros. What you'll learn Why "Zone 2" has multiple definitions—and which one holds up physiologically How to use substrate utilization (fat vs. carb) to define zones 1–3 with confidence The pitfalls of percentage-based zones and lactate-only methods (and when they mislead) How to spot true zone boundaries using trendlines and slope changes in VO₂/VCO₂ Practical coaching takeaways: Zone 1 as real recovery, Zone 5 for mitochondrial density, and how to "train to train" when limitations exist Why respiratory mechanics can be the hidden limiter—and how to address it before piling on intensity How to individualize plans so beginners avoid injury and advanced athletes actually progress If you want zones that match your physiology—not an algorithm's guess—this one's your blueprint.   Follow KORR: Instagram: https://www.instagram.com/korrmedical/  Facebook: https://www.facebook.com/korrmedical/  LinkedIn: https://www.linkedin.com/company/korrmedical https://korr.com/  Listen to the Metabolic Mastery Podcast: Apple Podcast: https://podcasts.apple.com/us/podcast/metabolic-mastery/id1812972674  Spotify: https://open.spotify.com/show/2sgLMFv1Z8DwEz87yUpapI?si=29a177a6c6ca4ed4  YouTube: https://www.youtube.com/@korrmed/podcasts  YouTube Music: https://music.youtube.com/playlist?list=PLVCRWXBDdFo_S0OeaAsPv8xTnfajTLc75&si=d4wVUA0jqajkbukB  Amazon: https://music.amazon.com/podcasts/d76834b7-c11a-485f-8010-32b490d49e57/metabolic-mastery