Fundamentals · F02

What Actually Limits Performance

What sets the ceiling on human output — and which limiters most training approaches don't account for.

Core Concept

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CNS Fatigue Limits Performance
Core Concept · F02

The Limits of Human Performance: CNS Fatigue, Energy Supply, and Recovery

Most training programs address muscle output. The actual ceiling is higher upstream — in the nervous system's willingness to drive effort. Understanding this changes how you train, recover, and interpret exhaustion.

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The Full Picture

11 articles
Average VO2 Max by Age
01

Average VO2 Max by Age: What Your Number Actually Means (And What It Doesn't)

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Oxygen Delivery vs Aerobic Conditioning
02

Oxygen Delivery vs. Aerobic Conditioning: Why They're Not the Same Thing

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Mitochondrial Density
03

Mitochondrial Density and Performance Capacity

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Oxygen Utilization
04

Why Oxygen Utilization Matters More Than Oxygen Availability

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Oxygen Utilization
05

Glycogen Depletion: The Hidden Limiter

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Oxygen Utilization
06

Glycogen Depletion: What Actually Happens When Carbs Run Low

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Oxygen Utilization
07

Central Governor Theory: Why Your Brain Shuts You Down Before Your Muscles Fail

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Oxygen Utilization
08

What Causes Muscle Fatigue During Exercise: Why Performance Falls Off Late

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Why do some days feel effortless
09

Why Do Some Days Feel Effortless (And Others Don't)?

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Why do some days feel effortless
10

What Is Cardiac Output and Why It Determines Sustained Performance

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