The Dark Miles: What Ultra-Runners Know About Surviving Your Worst Moments (That Most CEOs Don't)

Every ultra-runner knows the feeling. You're somewhere between mile 60 and mile 75. The daylight is gone. Your legs have stopped cooperating. The finish line feels abstract, almost theoretical. Quitting, on the other hand, feels very real, very rational, even generous to yourself.

Ultra-runners call these the dark miles.

And if you're a founder, CEO, or entrepreneur, you've been there too. Not on a mountain trail, but in a quarter where everything is breaking at once. In the moment when your best people are doubting the strategy, the cash position is tight, and your own conviction has gone quiet. The business equivalent of mile 72 at 2 a.m.

The question isn't whether you'll hit your dark miles. You will. The question is whether you've trained for them.

What the Research on Ultra-Runners Actually Tells Us

Sports science has been studying what separates finishers from DNFs (Did Not Finish) in ultra-endurance events for years, and the findings are striking. A peer-reviewed study on trail runners found that mental toughness, mediated by resilience, explained 21% of total performance variance. Not pace, not VO2 max, not training volume. Mental toughness and resilience, working together, accounted for more than a fifth of who crosses the finish line.

What's more, elite ultra-runners don't power through dark miles with sheer willpower. Research shows they use deliberate psychological strategies: positive self-talk, attentional reframing, and controlled dissociation. They don't fight the difficulty. They change their relationship with it. "I can do this" replaces "this is unbearable." The next checkpoint replaces the finish line. The body's signals get re-interpreted, not ignored.

This distinction matters enormously, because most leaders try to push through their dark miles the wrong way: more hours, more pressure on themselves and their teams, more willpower. That approach has a ceiling, and the ceiling is low.

Why CEOs Hit Dark Miles More Often Than They Admit

According to DDI's Global Leadership Forecast 2025, 70% of CEOs report chronic stress, and 4 in 10 have seriously considered stepping away from their roles entirely. A McKinsey analysis found that today's high-performing leaders now openly discuss fitness routines, biometric tracking, and resilience training in ways that would have been foreign to the previous generation of executives.

The pressure is structural. You are making high-stakes decisions at volume, often with incomplete information, while simultaneously carrying the weight of others' livelihoods. The Gallup State of the Global Workplace 2025 report found that managers now report higher daily stress than the employees they lead. At the top, the dark miles don't end when the crisis does. Another one is usually forming.

What changes is not the external environment. What changes is your internal capacity to navigate it without your decision-making collapsing under load.

The Three Strategies Ultra-Runners Use (That Transfer Directly to Leadership)

### 1. Shrink the horizon

Ultra-runners in crisis mode stop thinking about the finish line. They shift their attention to the next aid station, the next kilometre marker, sometimes the next ten steps. This is not giving up on the goal. It is a deliberate cognitive strategy to reduce overwhelm and restore agency.

Leaders can apply this directly. When the dark miles hit in business, the 3-year strategy becomes noise. What matters is the next decision, the next conversation, the next day. Shrinking the horizon isn't a failure of ambition; it's a precision tool for forward movement when the full picture is destabilising.

### 2. Reframe the signal, not the situation

Research confirms that ultra-runners don't suppress the pain of difficult miles; they reframe what the pain means. "This feeling means I'm deep enough in the race that it's real. This is where it gets decided." The discomfort becomes evidence of significance rather than evidence of danger.

For founders and CEOs, the business version of this reframe is powerful. The anxiety you feel at a critical inflection point is not a sign you're the wrong person for the challenge. It is a signal that you care deeply about the outcome and that the stakes are real. That reframe alone can shift you from avoidance to engagement.

### 3. Pre-train for pressure, not just for conditions

This is where most leaders leave enormous performance on the table. In sports, this is called Stress Inoculation Training (SIT): deliberately exposing yourself to controlled versions of the stressors you'll face in competition, building automatic, competent responses before the real event. Special forces units, tactical athletes, and elite performers use SIT as a standard part of preparation.

CEOs almost never do this. They prepare content for board presentations but rarely rehearse the moment when a board member challenges a core assumption in public. They plan for growth scenarios but rarely run themselves through the cognitive and emotional experience of a genuine crisis. The result is that dark miles in business are both more destabilising and more surprising than they need to be.

Pre-training for pressure means: running crisis simulations, practising difficult conversations in advance, deliberately doing cognitively demanding work in a fatigued state, and building routines that hold when everything else is uncertain.

The Cognitive Load Warning Most Leaders Miss

There is a physiological dimension here that deserves attention. Research on athletes shows that after extended periods of cognitive effort, decision-making accuracy drops by up to 30%, even when physical exertion remains constant. The brain's prefrontal cortex, the region responsible for judgment and executive function, degrades under sustained load.

This is not a weakness. It is biology. And it affects CEOs exactly as it affects athletes. The difference is that endurance athletes track this: they know that mile 70 is not the time for complex strategic recalculation. They simplify. They execute the plan they made when fresh.

Leaders need the same discipline. The dark miles of a business crisis are not the moment for a strategy overhaul. They are the moment for executing the decision framework you built in clarity. If you haven't built that framework in advance, you're making your biggest decisions in your most compromised cognitive state.

Building Your Dark Miles Capacity

The good news embedded in all of this research is consistent and clear: resilience is not a fixed trait. It is a trainable capacity. Ultra-runners who complete 100-mile races are not born with extraordinary pain tolerance. They have accumulated thousands of hours of training that includes deliberately hard sessions, races that didn't go to plan, and the experience of navigating difficulty and coming out the other side with both competence and self-knowledge.

Leaders can build the same capacity. The methods differ in form but not in principle: deliberate stress exposure, recovery cycles, reframing practice, and an honest relationship with your own signals of overload. The equation applies here: Performance = Potential − Interference. Dark miles are high-interference environments. The training objective is not to eliminate the interference. It is to reduce how much it costs you.

Concrete Next Steps

1. Map your last dark miles moment. Identify the last time you hit a genuine business crisis: when did you know you were in it? What did your thinking look and feel like? What worked and what didn't? This debrief is your training data.

2. Build a "dark miles protocol." Before the next crisis, define your three defaults: what you will focus on, what you will protect (sleep, a key relationship, a daily anchor), and what decision you will delay until you're through the worst of it.

3. Introduce deliberate pressure rehearsal. Once per quarter, run a scenario that puts you in a cognitively and emotionally demanding position. A difficult stakeholder conversation, a crisis simulation, a challenging board question, before the stakes are real. Build the neural pathways in training, not in the race.

4. Shrink the horizon intentionally. When you notice yourself overwhelmed by the scale of a challenge, write down the single next action that matters. Not the 12-step plan. The one next step. Return to strategy when the acute phase passes.

5. Track your cognitive load, not just your output. Notice the conditions under which your judgment is reliable and the conditions under which it isn't. Protect high-quality decisions for high-quality mental states. This is not self-indulgence; it is performance architecture.

The dark miles will come. In your next race and in your next business cycle. The only variable under your control is how prepared you are when they arrive.