The Factor of Safety: What Engineering Taught Me About Burnout (Before I Understood My Own)

Every structure an engineer designs has something called a factor of safety built into it. A bridge rated to hold 100,000 pounds isn’t actually built to carry exactly 100,000 pounds — it’s built to carry several times that, because engineers know real-world conditions are unpredictable. Materials fatigue. Loads shift. Things run hotter and harder than the spec sheet ever accounted for. You always build in margin, because a system running at its exact limit, day after day, is a system waiting to fail.

I spent years designing with that principle before I ever thought to apply it to myself.

Redlining, Day After Day

If you’ve ever driven a car with a tachometer, you know the red zone.  The RPM range where you’re pushing the engine past what it’s built to sustain. You can redline an engine for a few seconds, climbing a hill or passing on the highway, and it’s fine. The system recovers. But hold an engine in the red zone for miles, and something starts to give. Not dramatically, at first. Just… wear. Heat. A part working harder than it’s designed to, for longer than it’s designed to.

That was me, for years, as an engineer. Deadlines, back-to-back meetings, the quiet expectation that being “in the red” was just what ambitious people did. I ate “clean.” I tracked my macros. I exercised on schedule, like a maintenance plan for a machine I assumed was still running fine.

But I wasn’t a machine with a maintenance plan. I was a body with a nervous system, and it had been redlining for so long it forgot what idle even felt like.

The System Doesn’t Know the Difference

Here’s what I didn’t understand back then, and what I now spend most of my time helping clients understand: your nervous system doesn’t distinguish between “urgent deadline” and “actual danger.” Both register as threats. Both trigger the same response; cortisol floods your system, digestion slows, sleep gets shallow, and your body shifts into a very specific mode: hold on to what you have, because we might need it to survive.

That includes fat storage. When your body believes it’s under sustained threat, releasing weight isn’t a priority — protecting reserves is. This is why so many high achievers do everything “right” on paper; clean eating, consistent workouts, discipline in spades But still feel stuck. The plan isn’t the problem. The system running underneath the plan is operating in survival mode, and no amount of willpower can override physiology.

I know, because I tried. For a long time, I treated my own burnout like an engineering problem I could out-optimize. It doesn’t work that way. You can’t debug a nervous system with a better spreadsheet.

Building in Margin, On Purpose

What actually changed things for me wasn’t a stricter plan, it was learning to build margin back into my system, the same way I would have built margin into any structure I designed. 

That meant:

• Regulating my nervous system directly. Not waiting for a vacation to “reset,” but using small, real tools throughout the day that signal safety to my body in the moment.
• Practicing mindfulness that fit my actual life. Not 20 minutes of stillness I didn’t have time for, but practices that worked inside a full calendar.
• Using intermittent fasting with my body’s state, not against it. Because fasting done in a body that’s already in survival mode just adds another stressor, not a solution.

That combination of nervous system regulation, mindfulness, and properly timed fasting is now the core of how I coach my clients. Not because it’s trendy, but because it’s what actually worked for me when nothing else did.

Where Are You Redlining Right Now?

If any of this sounds familiar, the exhaustion that sleep doesn’t fix, the plateau despite doing everything “right,” the sense that you’re always a little bit in the red.  It might be worth finding out exactly where your nervous system stands before changing anything else.

I built a free 2-minute self-assessment to help with exactly that. It walks through the real signs of fight-or-flight and gives you a personalized result, whether you’re running with healthy margin or deep in the red zone.

Take the free quiz:

Are You Stuck in Fight-or-Flight?

And if you’re ready to talk through what building real margin back into your life could look like, I’d love to hear your story.

Schedule a Free Discovery Call

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About Jenn Greer, Health & Mindset Coaching

Your guide to transformation,

Jenn Greer 

Certified Integrative Health, Mindset, & Fasting Coach