Essentials: How to Build Endurance
Andrew Huberman, a professor of neurobiology and ophthalmology at Stanford, explains how to build endurance by targeting specific physical and mental systems. He details four distinct conditioning protocols—muscular, long-duration, high-intensity anaerobic, and high-intensity aerobic—and emphasizes the critical roles of hydration, electrolytes, and mindset in sustaining effort and enhancing overall performance.
Deep Dive Analysis
11 Topic Outline
Introduction to Endurance and its Importance
Body's Energy Production: ATP and Fuel Sources
The Neural Basis of Willpower and Quitting
Physiological Limiting Factors for Endurance Performance
Muscular Endurance: Training and Adaptations
Long-Duration Endurance: Efficiency and Physiological Changes
High-Intensity Anaerobic Endurance Training
High-Intensity Aerobic Endurance Training
Brain and Heart Adaptations from Endurance Training
Critical Role of Hydration and Electrolytes
Supplements for Endurance
8 Key Concepts
ATP (Adenosine Triphosphate)
ATP is the fundamental energy currency required for all bodily efforts, generated by muscles and neurons using various fuel sources like phosphocreatine, glucose, glycogen, and fats. Oxygen is often critical for the efficient conversion of these fuels into ATP.
Central Governor
The central governor is a neural system in the brain that mediates the decision to continue or stop an effort, influencing willpower and the perception of fatigue. It often dictates quitting before the body's absolute physical limits are reached.
Locus Coeruleus
This is a small group of neurons located in the brainstem that releases epinephrine (adrenaline), acting as a crucial readiness and alertness signal for the entire brain. Its activity significantly influences one's desire and willingness to sustain effort.
Concentric Loading
Concentric loading refers to the phase of muscle contraction where the muscle shortens or lifts a weight. In muscular endurance training, minimizing the slow or heavy eccentric (lengthening) component and focusing on concentric movements helps reduce soreness and build endurance.
Mitochondrial Density
Mitochondrial density is the increase in the number of mitochondria, the energy-producing organelles, within muscle cells. This adaptation, particularly enhanced by long-duration endurance training, improves the efficiency of ATP creation for a given effort.
Capillary Beds
Capillary beds are tiny networks of blood vessels within muscles that expand and increase in density with certain types of endurance training. This expansion allows for greater oxygen and fuel delivery to muscle tissues, enhancing sustained performance.
VO2 Max
VO2 max represents the maximum rate of oxygen consumption an individual can achieve during intense exercise, serving as a key indicator of aerobic fitness. High-intensity anaerobic training can push the body to exceed this oxygen utilization threshold.
Stroke Volume
Stroke volume is the amount of blood pumped by the heart with each beat. High-intensity endurance training strengthens the heart muscle, leading to an increased stroke volume, which results in more efficient delivery of oxygen and fuel to the body and brain.
10 Questions Answered
The body primarily uses phosphocreatine for short, intense bursts, then glucose (carbohydrates), glycogen (stored carbohydrate), and fats (lipids) for sustained effort, all of which are converted into ATP.
The primary limiting factor is often the central governor system in the brain, which decides whether to continue or quit, mediated by neurons and influenced by factors like glucose and electrolytes.
Oxygen is not a fuel itself, but it is essential for the metabolic process that converts fuel sources like carbohydrates and fats into usable energy (ATP), much like oxygen is needed to burn logs in a fire.
Willpower is fundamentally a neural process, involving neurons in the brain (like the locus coeruleus releasing epinephrine) that signal readiness and encourage continued effort, making the decision to quit largely a mental rather than purely physical event.
The five main categories of systems that allow us to engage in effort and endure are nerves, muscles, blood, heart, and lungs.
Neurons primarily need glucose for fuel and electrolytes (sodium, potassium, magnesium) to generate electrical impulses, along with a stable pH environment.
Repeated long-duration efforts build mitochondrial density and expand capillary beds within muscles, allowing the body to create more ATP and deliver more oxygen for a given effort, thus burning less fuel overall for the same performance.
This type of training improves ATP and mitochondrial function, enhances blood and oxygen delivery to muscles and the brain, increases lung capacity, and strengthens the heart muscle, leading to improved cognitive functioning and overall endurance.
Losing even 1-4% of body weight in water can reduce work capacity by 20-30% and significantly impair mental operations and thinking ability.
Electrolytes like sodium, potassium, and magnesium are critical for neural function, enabling nerve cells to fire and muscles to contract, and are essential for maintaining proper hydration and preventing brain and heart dysfunction.
11 Actionable Insights
1. Strengthen Heart Stroke Volume
Engage in high-intensity training where your heart beats very hard (e.g., 1:1 ratio mile repeats). The increased blood return to the heart causes an eccentric loading of the cardiac muscle, making the heart stronger and able to pump more blood per beat, which improves fuel delivery to muscles and brain, enhancing cognitive function.
2. Implement High-Intensity Aerobic Conditioning
Engage in 3-12 sets of work with a 1:1 work-to-rest ratio (e.g., run a mile, then rest for the same duration it took to run). Focus on performing 8-12 minutes of work per set, 2-3 times a week, to improve ATP and mitochondrial function, enhance oxygen delivery to muscles and brain, increase heart stroke volume, and build lung capacity.
3. Practice High-Intensity Anaerobic Endurance
Perform 3-12 sets with a work-to-rest ratio of 3:1 to 1:5 (e.g., 30 seconds on/10 seconds off, or 20 seconds on/100 seconds off), up to twice a week. This training pushes the system above VO2 max, maximizing oxygen utilization, increasing mitochondrial respiration, and training neurons to access more energy, with benefits for competitive and team sports.
4. Build Muscular Endurance
Perform 3-5 sets of 12-100 repetitions (12-25 reps for most) with 30-180 seconds of rest between sets. Focus on mainly concentric movements with light and relatively fast eccentric portions, avoiding deliberate slowing or heavy lowering phases, or use isometric holds like planks and wall sits, to build local mitochondrial oxygen utilization and neuron control over muscles.
5. Engage in Long-Duration Endurance
Perform continuous, steady effort for 12 minutes to several hours (e.g., a 30-minute run) to build mitochondrial density, improve movement efficiency, and increase capillary beds within muscles, enhancing oxygen delivery and overall energy creation.
6. Maintain Optimal Hydration & Electrolytes
Prevent 1-4% body weight loss in water during exercise, as this can reduce work capacity by 20-30% and significantly impair mental operations. Ensure adequate intake of potassium, sodium, and magnesium to support hydration and prevent electrolyte imbalance.
7. Use Galpin Equation for Exercise Hydration
Calculate your hydration needs during exercise by dividing your body weight in pounds by 30 to determine how many ounces of water to drink every 15 minutes of exercise. Adjust intake based on sweating and existing hydration levels.
8. Support Neural Function
Ensure sufficient intake of sodium, potassium, magnesium, and glucose (carbohydrates) to power neurons, which are critical for persistence and preventing quitting during effort.
9. Enhance Brain Function
High-intensity endurance training increases vasculature and capillary beds within the brain, particularly in areas supporting memory (hippocampus), respiration, focus, and effort, leading to improved cognitive functioning.
10. Consider Caffeine for Performance
Use caffeine as a stimulant to improve endurance work and power output across various forms of endurance training.
11. Use Magnesium Malate for Soreness
Consider supplementing with magnesium malate to reduce delayed onset muscle soreness (DOMS), noting it is distinctly different from magnesium forms used for sleep.
3 Key Quotes
The reason we quit is rarely because our body quits, our mind quits.
Andrew Huberman
That whole discussion about how much is mental, how much is physical is absolutely silly. It's 100% nervous system. It's neurons.
Andrew Huberman
Oxygen is not a fuel, but like a fire that has no oxygen, you can't actually burn the logs, but when you blow a lot of oxygen onto a fire, basically onto logs with a flame there, then basically it will take fire, it will take fire, it will burn, okay? Oxygen allows you to burn fuel.
Andrew Huberman
3 Protocols
Muscular Endurance Training Protocol
Andrew Huberman- Perform 3 to 5 sets of 12 to 100 repetitions (12-25 reps is more reasonable for most).
- Rest for 30 to 180 seconds between sets.
- Focus on mainly concentric movements, avoiding any major eccentric (lowering) loads.
High-Intensity Anaerobic Endurance Training Protocol
Andrew Huberman- Perform 3 to 12 sets.
- Maintain a work-to-rest ratio of anywhere from 3:1 (e.g., 30 seconds on, 10 seconds off) to 1:5 (e.g., 20 seconds on, 100 seconds off).
- Perform work at a speed that allows for good, safe form, even if repetitions slow down over sets.
- Push through the desire to stop, safely repeating sets to train neurons and mitochondria.
High-Intensity Aerobic Conditioning Protocol
Andrew Huberman- Perform 3 to 12 sets.
- Use a 1:1 work-to-rest ratio (e.g., run a mile, rest for the same duration it took to run, then repeat).
- Aim for work bouts of 8 to 12 minutes.
- Perform this type of training 2-3 times per week if not doing many other intense activities.