The Impossible Is Often Just the Unproven

Why every great achievement expands what the rest of us believe is possible

Last night at the London Stadium Josh Kerr ran a mile in 3 minutes and 42.66 seconds. He beat a record that had stood for 27 years (Hicham El Guerrouj’s mark from 1999) by nearly half a second. He took something that had stood for almost three decades, a time that had begun to feel almost permanent, and showed us that even our most enduring limits are often temporary. He moved the boundary marker of human possibility. Whenever something like this happens, I always find myself thinking about Roger Bannister.

The wall was never there

On the 6th of May 1954, no human being had ever run a mile in under four minutes. For decades almost everyone had agreed that the human body couldn’t. Physiologists even debated whether the heart would fail if the body ran that fast. Coaches trained around the barrier rather than through it. Four minutes was a wall rather than a target, and the wall had been there so long that nobody thought to ask what it was made of. Roger Bannister ran 3:59.4. 46 days later, John Landy broke his mark. Within three years, sixteen more runners went under four minutes. The wall didn’t erode, it simply stopped existing, all at once, in the minds of everyone who’d been running scared of it. The body often stops where the mind believes the limit to be. Bannister showed us that many of our limits are stories masquerading as facts, and every world record since then has carried a little piece of that lesson.

Why a belief can move a body

There’s a well documented mechanism behind this, and it comes down to something psychologists call self efficacy - your internal conviction that a specific goal is actually reachable by you. It’s not generic confidence, ’it’s task specific belief, and it shapes effort, pain tolerance and pacing decisions in ways that show up on the clock. Endurance performance isn’t purely a function of lungs and legs. A significant part of it is governed by the brain’s own pacing system, a kind of internal negotiation that constantly asks, mid race, how much more can I actually give here without breaking. That negotiation is informed by precedent. If your brain has evidence that a pace has been sustained before (by you, or by someone else who’s shown it’s survivable) it permits more. If it has no such evidence, it holds you back, often well short of your physiological limit, purely as insurance. This is why a broken record so often comes with company close behind. It’s because the field has just been handed new evidence about what a human body can absorb. It’s because the evidence about the ceiling moved.

Records are interesting things. They are numbers, yes, but they are also messages. They tell us that a human being was here. A human being with the same bones, the same muscles, the same fears and doubts, discovered that the boundary was further away than everyone thought. Josh Kerr’s run represents exactly that. Somewhere in the world tonight, there will be young runners watching that race. For them, 3:42.66 will not feel mythical, it will feel real and attainable, a target rather than a fantasy. And maybe one day one of them will run faster.

That is the beautiful thing about human achievement. Every breakthrough opens a door, and very great performance stretches the imagination of everyone who witnesses it. That’s also the part of this story that reaches past athletics. Most of us are not chasing world records, but most of us are carrying some version of the four minute mile, a target we’ve decided, often without evidence, sits just beyond what we’re capable of. A revenue number, a distance, aversion of a career, or a relationship, or a body, that we’ve filed under not for people like me. We rarely test these walls. We just build our lives around them, the way milers once trained to stay comfortably outside four minutes rather than risk finding the wall wasn’t real. This is why sport matters so much. From time to time it shows us things that extend far beyond athletics. It shows us that the limits we live with are often provisional. The impossible is frequently just the unproven.

Find your own version

The useful move isn’t to wait for someone else to break your wall for you. It’s to go looking for the nearest available proof that it can be broken at all. Bannister studied splits obsessively before his run, he wanted evidence the pace was survivable, not just hope that it was. Kerr built a season of documented training around a number he’d already said out loud. Both of them did the same thing before the belief became real. They went and found the smallest piece of evidence they could stand on, and then they stood on it.

Find your own version. The person one step ahead of you who’s already done the thing you’ve ruled out. The version of the task, broken into a smaller piece, that you’ve already proven you can survive. Evidence doesn’t have to be total to be enough, it only has to be enough to make the wall feel like a story again, instead of a fact. And maybe the most powerful thing one human being can do is not just achieve something remarkable, but expand another person’s sense of what might be possible.

Roger Bannister did that, Josh Kerr has done it again. The clock stopped at 3:42.66, but in another sense something else happened entirely. The horizon moved, and all of us, whether we realise it or not, just inherited a slightly larger idea of what human beings can become. The wall was never really there. It just took someone willing to run at it like it wasn’t.