Leah Alkalay (author) and Ashley Chen (mentor)
Anyone who has made it past mile 18 of a marathon knows the feeling. It might start as a dull ache in your arches before slowly becoming a heavy sensation in your quads. Eventually, your mindset starts to shift. Your internal monologue, usually a source of encouragement, suddenly becomes your worst enemy, listing every reason why stopping is the only logical choice. This is what runners call ‘the wall.’
Any sane person experiencing the wall for the first time would think it’s a sign that your body has reached its limits. Science tells a much more interesting story: the wall actually isn’t a physical limit at all, it’s a hallucination that keeps you safe.
The Insula as an Emergency Brake
For decades, exercise science treated fatigue like a simple mechanical failure, similar to a car running out of gas. It was theorized that once your fuel tanks depleted or lactic acid levels built up, the muscles simply got tired and gave out (Noakes, 2007). However, Noakes’ Central Governor Model suggests that fatigue isn’t a barrier. Rather, it’s an emotional boundary set by your brain to protect your body’s vital organs.
This setup lives in the insular cortex, a region of the brain that regulates internal states (e.g., interoception, emotion processing). As you run, your insula constantly checks in on your body by monitoring your core temperature, blood pH, and glucose levels (St Clair Gibson et al., 2003). The second these numbers begin to reach dangerous or unhealthy levels, it pulls the alarm. You’re suddenly hit with a wave of overwhelming exhaustion that makes you feel like you’re at your limit. This is the wall. In actuality, your tank isn’t as close to empty as it feels—your brain is only activating a proactive safety mechanism to ensure you don’t collapse.
Mind Over Matter
If our brains lie to us, how do we ever finish a race? It’s a huge power struggle: the old, survival-oriented brain and the modern prefrontal cortex (PFC), where willpower and goal-setting originate, fight for control.
To push through those final miles, your PFC must quiet the distress signals sent from the insular cortex. Think of it as a tug-of-war. When an individual is deep in pain, deciding to keep running is not just a matter of moving the legs, but a conscious psychological override of their survival instincts telling the body to stop (Marcora & Staiano, 2010). This cognitive control is what separates elite competitors. Indeed, neural imaging of professional athletes demonstrates their unique ability to maintain PFC activation under extreme exertion, which silences the brain’s signals to quit (Robertson & Marino, 2016).
The Mental Payoff
Pushing through the wall is about more than just making it to the finish line. Every time you negotiate with your internal governor (i.e., PFC) and win, you are training your brain. Forcing the PFC to silence those survival alarms helps rewire and strengthen the neural pathways you rely on to stay calm under pressure (Donofry et al., 2021). As a result, you may develop cross-stressor adaptation, a form of physiological resilience that can protect against other stressors (Donofry et al., 2021) and may help one succeed in high-stakes academic or work settings (Hillman et al., 2008).
Ultimately, the wall isn’t a barrier you need to fear. When you learn to see the wall for what it is, a protective mechanism against an overprotective brain, you realize that you can accomplish much more than your biology wants you to believe.
References
Donofry, S. D., Stillman, C. M., Hanson, J. L., Sheridan, M., Sun, S., Loucks, E. B., & Erickson, K. I. (2021). Promoting brain health through physical activity among adults exposed to early life adversity: Potential mechanisms and theoretical framework. Neuroscience & Biobehavioral Reviews, 131, 688-703. https://doi.org/10.1016/j.neubiorev.2021.09.051
Hillman, C. H., Erickson, K. I., & Kramer, A. F. (2008). Be smart, exercise your heart: Exercise effects on brain and cognition. Nature Reviews Neuroscience, 9(1), 58-65. https://doi.org/10.1038/nrn2298
Marcora, S. M., & Staiano, W. (2010). The limit to exercise tolerance in humans: mind over muscle?. European Journal of Applied Physiology, 109(4), 763-770. https://doi.org/10.1007/s00421-010-1418-6
Noakes T. D. (2007). The central governor model of exercise regulation applied to the marathon. Sports Medicine, 37(4-5), 374–377. https://doi.org/10.2165/00007256-200737040-00026
Robertson, C. V., & Marino, F. E. (2016). A role for the prefrontal cortex in exercise tolerance and termination. Journal of Applied Physiology, 120(4), 464-466. https://doi.org/10.1152/japplphysiol.00363.2015
St Clair Gibson, A., Baden, D., Lambert, M., Lambert, E., Harley, Y., Hampson, D., Russell, V., Noakes, T. (2003). The conscious perception of the sensation of fatigue. Sports Medicine, 33(3), 167-176. https://doi.org/10.2165/00007256-200333030-00001