Dr. Andy Galpin: How to Build Physical Endurance & Lose Fat | Huberman Lab Guest Series

Dr. Andy Galpin: How to Build Physical Endurance & Lose Fat | Huberman Lab Guest Series

Huberman LabFeb 1, 20233h 48m

Andrew Huberman (host), Andy Galpin (guest), Narrator

Definitions and types of endurance (muscular, anaerobic, aerobic, long-duration)Mechanisms of fat loss: carbon metabolism, CO₂ exhalation, and energy balanceEnergy systems: phosphocreatine, glycolysis, mitochondrial (aerobic) metabolism, and fat oxidationMetabolic flexibility and carbohydrate vs fat utilization mythsBreathing mechanics, CO₂ tolerance, and their impact on enduranceEndurance training protocols: intervals, steady state, “exercise snacks,” and mixed circuitsProgramming endurance alongside strength/hypertrophy for health, aesthetics, and performance

In this episode of Huberman Lab, featuring Andrew Huberman and Andy Galpin, Dr. Andy Galpin: How to Build Physical Endurance & Lose Fat | Huberman Lab Guest Series explores science-Backed Endurance Training: Burn Fat, Breathe Better, Perform Longer, Stronger This episode with Dr. Andy Galpin unpacks endurance as far more than just long, slow cardio. He defines four main endurance types—muscular endurance, anaerobic capacity, maximal aerobic output, and long-duration endurance—and shows how each is constrained by two things: energy production and fatigue/waste management.

Science-Backed Endurance Training: Burn Fat, Breathe Better, Perform Longer, Stronger

This episode with Dr. Andy Galpin unpacks endurance as far more than just long, slow cardio. He defines four main endurance types—muscular endurance, anaerobic capacity, maximal aerobic output, and long-duration endurance—and shows how each is constrained by two things: energy production and fatigue/waste management.

Galpin explains how fat loss actually works at the molecular level (carbon in, carbon out via CO₂ exhalation), why exercise type matters less for fat loss than consistency and total energy turnover, and why metabolic flexibility—using carbs and fats efficiently—is a key health and performance goal.

He then maps specific, highly practical training protocols (short “exercise snacks,” all-out intervals, moderate steady-state, and multi-exercise circuits) to each endurance quality, while clarifying common myths about fasted training, “fat-burning zones,” and lactate.

Listeners come away with a clear, time-efficient weekly structure that can be layered on top of strength/hypertrophy work to improve energy, aesthetics, and longevity without living in the gym.

Key Takeaways

Endurance Is About Two Things: Fueling and Fatigue Management

All endurance performance—whether a 20-second sprint or a marathon—comes down to (1) how you produce energy (from phosphocreatine, carbs, and fats) and (2) how well you manage fatigue and waste (especially CO₂, hydrogen ions/acid, and inorganic phosphate). ...

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Fat Loss Is ‘Carbon Out,’ Not ‘Fat-Burning Zone’ Magic

You lose body fat by exhaling its carbons as CO₂, not by “burning fat” during a specific workout type. ...

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Fasted Cardio and Low-Intensity ‘Fat Burning’ Are Overrated for Fat Loss

Training fasted or spending time in a low-intensity ‘fat-burning zone’ may increase the percentage of fuel coming from fat during that session, but this does not necessarily translate into greater total fat loss. ...

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Lactate Is a Fuel and Buffer, Not Your Enemy

Lactate is produced when pyruvate binds extra hydrogen ions during high-intensity work; it helps buffer acidity rather than cause it. ...

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You Need All Four Endurance Types for Real-World Fitness

Muscular endurance (local repetitions/posture), anaerobic capacity (20–90 seconds all-out), maximal aerobic output (5–15 minutes hard), and long-duration endurance (30+ minutes) are distinct but interlinked. ...

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Breathing Mechanics and CO₂ Tolerance Are Massive Force Multipliers

Good endurance starts with good mechanics: posture, breathing pattern, and movement efficiency. ...

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Minimal Effective Endurance: You Can Get a Lot Done in Little Time

A robust endurance base does not require hours daily. ...

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Notable Quotes

Endurance really comes down to two independent factors: fatigue management and fueling.

Andy Galpin

It’s not ‘calories in, calories out’ so much as ‘carbon in, carbon out.’

Andy Galpin

If the theory that low-intensity fat burning maximizes fat loss were true, the optimal fat-loss strategy would be to sleep.

Andy Galpin

You cannot turn fat into muscle, and you cannot turn muscle into fat.

Andy Galpin

Any living being is playing the same game: how do I make ATP and handle the waste?

Andy Galpin

Questions Answered in This Episode

You showed that almost any exercise modality can support fat loss if total carbon out exceeds carbon in. For someone who only enjoys walking and light hiking, how would you specifically progress volume and intensity to get them leaner without ever introducing running or intervals?

This episode with Dr. ...

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In your example of the fighter who must sustain five 5-minute rounds, how would you periodize their year so they cycle emphasis between anaerobic capacity, maximal aerobic output, and long-duration work without blunting their peak power and strength?

Galpin explains how fat loss actually works at the molecular level (carbon in, carbon out via CO₂ exhalation), why exercise type matters less for fat loss than consistency and total energy turnover, and why metabolic flexibility—using carbs and fats efficiently—is a key health and performance goal.

Get the full analysis with uListen AI

You mentioned that chronic very-low-carb diets downregulate glycolytic enzymes and hurt high-intensity performance. For an athlete currently ‘keto’ but wanting to reintroduce carbs and regain glycolytic capacity, what exact training and refeeding progression would you recommend over 8–12 weeks?

He then maps specific, highly practical training protocols (short “exercise snacks,” all-out intervals, moderate steady-state, and multi-exercise circuits) to each endurance quality, while clarifying common myths about fasted training, “fat-burning zones,” and lactate.

Get the full analysis with uListen AI

Given how central CO₂ tolerance and breathing mechanics are to endurance, what would a 10–15 minute standalone weekly ‘breathing training’ session look like if the goal is better performance and fewer panic sensations during hard intervals?

Listeners come away with a clear, time-efficient weekly structure that can be layered on top of strength/hypertrophy work to improve energy, aesthetics, and longevity without living in the gym.

Get the full analysis with uListen AI

You’ve argued that maximizing fat oxidation in a workout does not equal maximizing fat loss over weeks or months. What, in your view, are the most common mistakes people make when they chase ‘fat-burning zones’ or fasted cardio, and how would you redesign a typical influencer-style ‘fat-burning routine’ to be both more honest and more effective?

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Transcript Preview

Andrew Huberman

(Upbeat music) Welcome to the Huberman Lab Guest Series, where I and an expert guest discuss science and science-based tools for everyday life. I'm Andrew Huberman, and I'm a professor of neurobiology and ophthalmology at Stanford School of Medicine. Today's episode is the third in the six-episode series on fitness, exercise, and performance. Today's episode is all about endurance and fat loss. That is, the specific protocols required to achieve the four different kinds of endurance and how to maximize fat loss. Dr. Andy Galpin, great to be back. Today, we're going to talk about endurance, and I'm very interested in this conversation because I, like many other people, strive to get a certain amount of cardiovascular work in each week, maybe a long-ish jog, maybe a swim, ride the bike, et cetera. But when I think about the word endurance, the idea that almost immediately comes to mind is about doing something for a long period of time repeatedly, but I have a feeling that there are other ways to trigger this adaptation that we call the endurance adaptation. So, I'm excited to learn about that. I'm, uh, also excited to learn about the fuel systems in the body that allow for endurance and other modes of repeated activity. So, in order to kick things off, I'd love for you to frame the conversation by telling us, what is endurance and are there indeed a large variety of ways to induce what we call this endurance adaptation?

Andy Galpin

Sure. The way I want to start actually here is, is calling back to some of the things we talked about in our previous conversations, which are really, people ha- exercise for three reasons. Number one, you want to feel better. Number two, you want to look a certain way. And then number three, you want to be able to do that for a long time, right? So you need to went- the way that we say it in sports is look good, feel good, play good, right? So I want some sort of functionality to be able to perform a certain way, whatever that is for you. You want to be able to look a certain way that, whatever that matters for you, and then you want to be able to do that for a long time. So when it comes to endurance, we have a bunch of misnomers here, which is the same thing with the strength training or resistance exercise side, where, where we wanted to dispel this myth that I lift weights only because I, I want to gain muscle or play a sport, and I want to do cardio because I want to either lose fat or for long health's sake. And just like we smashed that myth from the strength training side, I want to smash it from the endurance training side. There are so many other reasons that you want to perform endurance training regardless of your goal, right? Whether that is longevity, whether it is performance, or whether it is aesthetics. And so we're gonna, I wanna cover all those reasons, uh, exactly what to do, uh, protocols, of course, a- and why those things are working that way. In general though, the quick answer is really endurance comes down to two independent factors. Factor number one is fatigue management and then factor number two is fueling. And that's all it really comes down to. So all the different types of training are going to reach a limitation, which are either, again, your ability to deal with some sort of fatigue, and that's generally a fatigue signal. The other one is managing some sort of restriction of energy input. And a lot of the... Spoiler here is, a lot of the times people think it's a fueling issue when really it's a fatigue management issue or the opposite. And to have a complete health spectrum, regardless of whether you're a high performance athlete like I typically deal with or general public, you need to be able to do both, manage fatigue as well as understand fuel storage. So that's really what we're gonna get into today.

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