“You think you’ve reached your limit; then something happens and you find you can go even further.” Ayrton Senna wasn’t only talking about engines and laps: he was talking about a feeling we all know, when our legs feel empty, our mind says stop, and we’re convinced we have nothing left to give. And yet, very often, it simply isn’t true.
The work of physiologist Samuele Marcora, at the University of Kent, backs this up through his psychobiological model of endurance. According to Marcora, we don’t stop pushing because the body has run out of fuel, but because the brain decides that the perceived effort — how hard the task feels — has reached a level we’re no longer willing to tolerate. In other words, the limit we feel is often a mental threshold, not a physical wall.
In a now-famous study, published in the Journal of Applied Physiology in 2009, Marcora and colleagues had volunteers complete ninety minutes of a demanding mental task before a physical test to exhaustion. The result? Those who arrived mentally fatigued gave up on average 15% sooner, even though their muscles and hearts were exactly the same. It is the tiredness of the mind, not only of the body, that moves our finish line.
The good news is that this threshold can be moved. Reducing perceived effort is possible: training even when you’re a little tired teaches the brain to tolerate effort; breaking a big goal into small milestones makes every step lighter; and even inner dialogue matters, because talking to yourself with encouragement rather than blame genuinely lowers the sense of strain. There’s no need to fool yourself — only to remember that the voice saying “enough” almost always arrives before the real limit.
This isn’t just about sport. It’s true for studying, for a hard project, for a rough day that seems endless. Next time you feel you have nothing left, try asking yourself: is it the body, or is it the mind that raised the white flag a moment too soon? Often, just an instant after that “I can’t”, there is still one small step available. And that step, added to a thousand others, is what we call going further.
Sources
- Marcora S.M., Staiano W., Manning V., “Mental fatigue impairs physical performance in humans”, Journal of Applied Physiology, 2009, 106(3), 857–864.
- Samuele Marcora, psychobiological model of endurance and the role of perceived effort, University of Kent (Sports Medicine, 2014).
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