I left a job I loved before I crashed out.

That sentence still feels strange to write, even months later. I spent a decade at HubSpot Academy, built something I was incredibly proud of, led a team I cared deeply about, and spoke at INBOUND eight times. And I left before burnout made the decision for me.

When burnout fully sets in—when you raise the white flag and say "I just can't do this anymore"—people understand. They sympathize. They say "I'm so sorry" and "you had no choice." But when you leave before it destroys your life, before you're a shell of a person, the response is different. There's an implicit question hanging in the air: Well, you had a choice, didn't you?

And that's exactly the point. We should be making decisions when we can, not when we have to.

Somewhere along the way, we internalized this idea that we have to earn the right to make a transition. That we need visible suffering to justify a major life change. That leaving while you still have energy and clarity somehow makes the decision less legitimate.

I once had a boss tell me that I could only leave the company if I was "trading up"—that leaving otherwise would be a bad decision. At the time, I didn't have the language to push back on that framing. But I think about it constantly now, because it perfectly encapsulates the scarcity trap so many of us live in.

That mindset positions you as a passive actor in your own career. It says the only legitimate reason to move is if someone else offers you something objectively "better" by some external metric. It completely erases the idea that you might leave toward something you're building, or leave because of what you're learning about yourself, or leave because staying would cost you something that can't be measured on a compensation sheet.

It keeps you stuck. And it convinces you that being stuck is somehow the responsible choice.

What I've come to realize is that there are two fundamentally different ways to approach career longevity, and the difference between them changes everything.

Endurability is about how much you can withstand. How long you can last. What's your capacity for discomfort? How much strain can you tolerate before you break? It's inherently about surviving, not thriving. The goal is to maximize your tolerance rather than to question whether the strain should exist in the first place.

Sustainability means you can keep going because the system is designed to replenish what it uses. There's a cycle. There's renewal. There's attention to what makes continuation possible without depletion. It asks: What needs to be true for this to work long-term? What do I need to build in so I'm not just burning through my reserves? When do I need to make a change so I can keep growing rather than just persisting?

When we build careers on endurability, we wait until we have to make a change. We push until we can't push anymore. We stay until our bodies or minds force the decision for us.

When we build careers on sustainability, we develop enough self-awareness to read the signs before we're at the breaking point. We notice when we're starting to become leaders we don't want to be. We pay attention when things start going in directions that don't align with who we are or want to become. And we make decisions while we still have the agency and energy to make them well.

Leaving proactively is actually harder than crashing out.

When you crash out, the narrative is simple. Everyone understands "I had no choice." There's clarity in crisis. There's validation in visible struggle.

But when you leave before it gets to that point, you can't control the narrative. There's ambiguity. People wonder. They might think you're being impulsive, or that you're running from something, or that you just didn't have what it takes to see it through.

And that ambiguity is terrifying. We want people to understand. We want them to validate our choices. We want the story to make sense to everyone, not just to us.

But the only person who has to understand your decision is you.

When you leave from a place of depletion, you're often spending months or even years just recovering before you can think clearly about what's next. You're at the bottom of the pit, trying to climb out.

When you leave with some reserves still intact, you can actually use that transition time intentionally—to reflect, to build, to design what comes next from a place of curiosity rather than desperation. You can walk away from something in a way that allows you to be a better person, a better professional, a better leader.

This isn't just a personal development issue. It's a leadership issue.

Leaders who wait until they're depleted can't show up the way their teams need them to. They're running on fumes. They're making decisions from a place of exhaustion rather than clarity. They're modeling endurance as a virtue when what their teams actually need is someone who demonstrates sustainable practices.

Making proactive changes: reading your own signals, trusting yourself enough to act before crisis forces your hand, that's actually more responsible leadership, not less.

It says: I'm paying attention to what I need in order to show up well. I'm not waiting until I'm so burned out that I'm no longer effective. I'm making a choice that honors both where I've been and where I'm going.

And it models for your team that they can do the same. That they don't have to wait until they're broken to make a change. That sustainability is the goal, not just survival.

So what does it actually look like to build a career—or a team, or a program, or a life—on sustainability rather than endurability?

It starts with developing the self-awareness to notice the early signs. Not just the obvious red flags, but the subtle shifts.

When are you starting to compromise on things that matter to you?

When are you noticing that you're not the leader you want to be?

When does "fine" start feeling like "at what cost"?

It requires believing in abundance rather than scarcity.

Not "I can't leave until I have something better lined up," instead "I can make a choice that's right for me, even if it doesn't make sense to everyone else."

Not "I have to stay because I might not find something else," instead "I trust myself to figure out what's next."

It means distinguishing between discomfort that comes from growth and discomfort that comes from misalignment. Not all hard things are worth enduring. Some hard things are signs that it's time for something different.

And critically, it means making decisions for yourself rather than waiting until circumstances make them to you. That's a completely different relationship with agency and self-trust.

When I left my recent role, I didn't have all the answers. I didn't have a five-year plan or a guaranteed path forward. What I had was clarity that it was time, and trust that I could figure out what came next.

If I'd waited for the crash, I'd be spending 2026 recovering, not creating. I wouldn't be building partnerships, developing frameworks, showing up for clients with my full strategic thinking. I'd be at the bottom of the pit, just trying to remember who I was before I was depleted.

Instead, I'm building something from a place of energy and intention. Not because I had to, but because I could.

The narrative you control is the one you tell yourself. And that narrative doesn't have to be about earning your exit or proving you were suffering enough to justify the change.

It can simply be: I made a choice that honored where I was going, not just where I'd been.

That's what sustainability looks like. And it's available to all of us, if we're willing to act before we have to.

Learning by Design is written by Courtney Sembler. Courtney currently helps companies build scalable customer education programs. After spending over a decade scaling HubSpot Academy globally, she now explores the systems, strategies, and realities of workplace learning, leadership, and customer experience—the kind that drives retention, adoption, and revenue by design, not by accident. Published twice weekly with monthly deep dives. Connect with her on LinkedIn and subscribe to Learning by Design.