Where Does the "I Want to Quit" Thought Come From? A Complete Breakdown of the Central Governor Theory

1. The Blind Spot of Traditional Views

Over the past half-century, sports science has held that “fatigue” originates in the muscles themselves: lactic acid buildup, glycogen depletion, insufficient ATP. But in the 1990s, South African sports scientist Tim Noakes challenged this—he found:

• Marathon finishers still had 30-40% of their strength reserves in their muscles
• They could immediately sprint to the finish line (if there was a competitor)
• The feeling of fatigue at “the same intensity” varied depending on the situation

Conclusion: Fatigue is not determined by the muscles—it is determined by the brain.

2. The Central Governor Theory

A “central governor” exists in the brain (widely believed to be located in the anterior cingulate cortex, ACC), and its job is to:

1. Predict: Based on training, fueling, and environment, predict the energy required to finish the race
2. Ration: Limit muscle recruitment (preventing you from pushing too hard)
3. Protect: Force a stop before a life-threatening situation occurs

So the thought of “I want to quit” is, at its core, your brain trying to protect you—it fears you might push yourself to cardiac arrest, dangerously high body temperature, or a blood sugar crash.

3. Six Factors That Influence the Central Governor

Factor	Increases Fatigue	Decreases Fatigue
Body temperature	Too high	Cool
Blood sugar	Too low	Sufficient
Hydration	Dehydrated	Sufficient
Information	Not knowing the distance	Knowing the remaining distance
Motivation	Low	High
Emotions	Anxious, lonely	Excited, with spectators

Key point: Some factors are physiological, some are psychological—this is the gap where we can “trick” the brain.

4. Why Can You Run So Fast in the “Final 1K”?

A classic phenomenon: in the final 1K of a marathon, many runners can hit their fastest pace of the entire race. Why?

The central governor loosens its grip. When it calculates “only 1K left, enough energy, no risk of death,” it allows the muscles to release their reserve power. This is the “End Spurt effect.”

Meaning: You are stronger than you think you are.

5. Seven Techniques to Trick the Central Governor

Technique 1: Cognitive Deception—Shorten the Distance

The brain is highly sensitive to “how much is left.” Research shows that telling yourself “only 3K left” (when it’s actually 5K) can improve performance. In practice:

• Break the marathon into 4 × 10K segments
• Set a mini goal every 5K
• Don’t think about “25K still to go”

Technique 2: Fueling Timing

The moment the first energy gel hits your stomach, the brain senses “sugar is coming,” immediately relaxes the governor, and power output increases. Even if the sugar hasn’t been absorbed yet, rinsing your mouth with a carbohydrate solution also works—this is the “carbohydrate mouth rinse effect.”

Technique 3: Body Temperature Management

Pouring ice water over your head or applying an ice towel to your neck can lower the brain’s “overheating” alarm. Even if your core temperature hasn’t dropped, a cool scalp is enough to deceive the central governor.

Technique 4: Listening to Music

Music diverts brain resources and reduces the perception of fatigue. Research shows that synchronous music (with a beat matching your cadence) can improve endurance by 15%.

Technique 5: Running with Others

Group runs, finding a pacer—social presence reduces the fatigue of loneliness. The central governor adjusts its alert level based on whether “support is available.”

Technique 6: Visualizing the Finish Line

When the brain perceives that “the goal is near,” it relaxes the governor. In practice: the moment you see the “5K to go” sign, immediately visualize the finish line.

Technique 7: Positive Self-Talk

Messages like “I’m okay” and “I’ve trained for this” are interpreted by the central governor as “resources are sufficient,” lowering the protective mechanism.

6. Don’t Trick It Too Much

The central governor exists for a reason—people can actually die.

Warning signs (you must stop):

• Blurred vision, dizziness
• Stopping sweating (a precursor to heatstroke)
• Persistent muscle cramping
• Chest pain, difficulty breathing
• Confusion

If any of the above occurs, withdraw from the race immediately. No PB is worth dying for.

7. Training the Central Governor: Accumulating Memories of “Successfully Pushing Through”

The brain calibrates its alert level based on past experience. Training methods:

Progressive Long Runs

• Week 1: 20K LSD
• Week 2: 25K LSD
• Week 3: 30K LSD
• Week 4: 35K LSD

Every time you push through, the brain learns: “Ah, I can go this far,” and the alarm level lowers next time.

Long Runs at Race Intensity

4-6 weeks before a marathon, do 30-35K tempo runs (close to your target pace) to familiarize the brain with “I can sustain this intensity.”

Mental Rehearsal

Visualize hitting the wall and breaking through it (see the visualization article). The brain responds more calmly to scenarios it has “already imagined.”

8. Advanced: Having a Conversation with the Urge to Quit

When the thought of “I want to stop” arises, don’t fight it—have a conversation:

• “Thank you for reminding me, I know I’m tired”
• “But my training supports me pushing through”
• “I’ll keep going, and if there’s a real danger signal, I’ll stop”

This kind of “acceptance-based dialogue” lowers the brain’s alert level, allowing you to keep producing output.

9. Tim Noakes’ Famous Quote

The brain is the master of fatigue.

Fatigue is not decided by the body—it is decided by the brain. This means: your limits are farther than you think, as long as you know how to communicate with your brain.

Next time you want to quit, remember: your brain is just doing its job, and you can help it adjust its alert level—you still have 30% left unused.

Related Reading

• Brain Activity While Running: The Central Fatigue Theory and Runners’ Peak Experiences
• Central Fatigue: What Limits Endurance Isn’t Just Muscles, But the Brain’s Brake
• Fatigue Management in Practice: The Central Governor Model and Peripheral Fatigue—Learning to Read How the Brain Hits the Brakes
• Breaking Through the Wall Mentally: The Neural Battle at Kilometer 30 of a Marathon