459: What's Really Possible: The Truth About Limitations and Possibilities

Every so often, something happens in sport that quietly reshapes what we believe is possible.

The recent London Marathon was one of those moments—where not one, but two runners pushed past the two-hour marathon mark. Whether you focus on the exact context or the symbolism, the impact is the same: it forces a question many runners eventually face in their own journey—are limits actually fixed, or are they just unchallenged?

As coaches and runners, this is something we come back to often. Not because we’re obsessed with elite performance, but because these moments mirror what happens in everyday running all the time. The barrier between “I can’t” and “I might be able to” is often thinner than we think. And most of it lives in belief, not biology.

Running has always been a sport of redefining limits.

The four-minute mile was once considered physically impossible—until Roger Bannister ran it. And once it happened, others followed.

We saw the same thing with Eliud Kipchoge’s sub-two-hour marathon project in 2019. Even though it wasn’t an official race record, it challenged the narrative of what the human body and mind can sustain over 26.2 miles. It didn’t just shift data—it shifted belief.

That’s the part we want to focus on:

Every time something “impossible” is done, it quietly expands what everyone else is willing to consider for themselves.

That applies just as much to the runner trying to stay consistent three days a week as it does to someone chasing a world record.

Let’s Talk About Neuroscience

One of the most important things to understand is that your brain is wired for survival, not for breaking barriers. 

From a nervous system perspective, unfamiliar goals feel like a risk. Not just physical risk, but emotional risk: disappointment, failure, wasted effort, embarrassment. 

So whenever you are faced with a challenge,` your brain does what it’s designed to do—it narrows the field of possibility to what feels predictable.

That’s why so many runners unconsciously set ceilings:

• “I’m not built for speed.”
• “I could never run that distance.”
• “That’s just not me.”

But those aren’t truths. They’re protective assumptions built from limited evidence.

And the key word there is evidence.

Your brain believes what you repeatedly show it.

So if you want to change what feels possible, you don’t start with bigger goals.

You start with better evidence.

Your Evidence File

Your evidence file is a mental and emotional collection of moments that prove you are capable of more than your current belief system allows.

Not just the big wins. In fact, mostly not the big wins.

We start with ALL of the little pieces of evidence that show that you have done certain things before and that you already are the person capable of achieving the big goal.

It’s:

• Showing up on the days you didn’t feel like it
• Finishing a run you wanted to quit
• Choosing consistency over perfection
• Coming back after a setback instead of disappearing

Most runners underestimate how powerful this is. Because your identity isn’t built on what you intend to do—it’s built on what you repeatedly prove to yourself you do.

When you start collecting enough of those moments, something shifts. You stop needing motivation to believe you’re a runner. 

You just are one.

What About Big Goals?

A lighthouse goal—whether it’s a marathon, a PR, or simply feeling strong in your body—only becomes useful when it guides behavior, not when it creates pressure.

Most people try to motivate themselves toward big goals, but motivation isn’t stable enough for that to work long-term.

What actually works is removing the size of the goal from the daily decision-making process.

That’s where reverse engineering comes in.

Instead of asking:

“Can I run a marathon?”

You ask:

“What are the small things I need to achieve in order to be able to get to that place?”

So we break it down: Small, repeatable actions remove emotional weight and replace it with direction.

Before you can run a marathon, you need to run a half marathon → before that you need to be able to run a 10k → before that you need to be able to run a 5k → before that you need to be able to run 3x per week consistently.

That’s where change actually lives.

Breaking big goals down into smaller goals and daily, repeatable actions.

Then we take it one step further…

Identity First: Becoming Before Achieving

One of the biggest secrets to achieving big goals is to BECOME the person capable of achieving that goal BEFORE you actually achieve it.

You don’t wait to become the runner you want to be. You decide and practice being that person now.

Most people reverse this. They think:

“Once I hit the goal, I’ll believe I’m that person.”

But it actually works the other way.

Identity drives behavior long before results show up.

So instead of:

• “I want to be consistent”

It becomes:

• “I am a consistent runner who is learning how consistency looks in real life.”

That shift matters because it removes the “all or nothing” thinking that keeps so many runners stuck. You’re no longer trying to earn identity—you’re practicing it.

So instead of thinking that you become a marathon runner when you cross the finish line, you ask…What would someone who is able to run a marathon be doing today? 

• That person would be running consistently 3-5 times a week
• That person would be getting 7-8 hours of sleep 
• That person would be fueling their body well to make sure they had energy for training
• That person would be consistently strength training 2-3x per week

Then, you start doing those things and BECOME that person. 

As that person, you will now do the things that will make that goal possible.

And possibility is a beautiful things…but we have to be careful it doesn’t turn into pressure and comparison.

The Two Sides of Possibility

Possibility is powerful, but it’s not neutral.

On one side, it expands you. It shows you what’s available, what’s achievable, what might be next for you.

On the other side, it can quietly turn into comparison:

• Why am I not there yet?
• I should be farther along.
• If they can do it, I should be able to do it faster.

That version of possibility doesn’t inspire action—it creates pressure.

And pressure without grounding leads to burnout, not growth.

The goal is not to chase someone else’s timeline. The goal is to expand your capacity to stay in your own process long enough for your results to catch up.

What You’re Really Building

At its core, this conversation isn’t about elite runners or record-breaking performances.

It’s about what happens inside you every time you decide whether something is “for you” or “not for you.”

Every runner has a line they’ve drawn somewhere—about speed, distance, consistency, identity.

And every time you challenge that line, even slightly, you are collecting evidence that your story is not finished.

Because what you repeatedly prove to yourself becomes what you believe is possible.

And what you believe is possible is what you eventually become.