
Simon Marshall, PhD and Lesley Paterson
A practical mental training guide for endurance athletes to build confidence, manage pressure, and perform at their best.
The book’s mental model of the brain (Chimp, Professor, Computer) is inspired by Dr. Steve Peters’ 'The Chimp Paradox'.
Section 1
9 Sections
Imagine the three main parts of your brain as roommates who don’t always get along: the impulsive, emotional Chimp; the calm, logical Professor; and the efficient, automatic Computer. These three are constantly debating who’s in charge, especially when you’re gearing up for a race or facing a tough workout.
The Chimp brain, ancient and primal, is wired to keep you alive by reacting fast to perceived threats. It’s the part that floods you with anxiety before a race start, even if there’s no real danger. It processes sensory information up to five times faster than your Professor brain, which means it often hijacks your thoughts before you can reason your way out of worry. Think about standing on the beach at the swim start, arms flailing, water everywhere, feeling like you might drown. That’s your Chimp freaking out, trying to protect you from a threat that’s mostly in your head.
Meanwhile, your Professor brain—the seat of logic, planning, and empathy—tries to calm the Chimp down, reminding you that it’s just a race, not a life-or-death situation. But the Professor is slower and easily pushed aside by the Chimp’s chemical messengers. This internal tug-of-war explains why you sometimes feel paralyzed by fear or frustration despite knowing better.
And then there’s the Computer brain, quietly running your habits and memories in the background. It’s your autopilot, storing everything your Chimp and Professor tell it, coloring your expectations and reactions. If your Computer is loaded with memories of past failures or fears, it will trigger those feelings automatically, even if your current situation doesn’t warrant them. This is why some athletes dread open water swims or technical descents long before they start.
But here’s the hopeful part: your brain is plastic and trainable. You can nurture your Chimp, strengthen your Professor, and reprogram your Computer. By recognizing which brain part is in charge, you can learn to calm the chaos and rise to the occasion with confidence.
As you move forward, you’ll discover how to build a strong athletic identity that aligns your thoughts and feelings, boosting your confidence and resilience. Let’s journey into that next chapter.
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