Breathwork for Stress: How Your Breath Quietly Runs Your Nervous System

Most of the tools we reach for when we're stressed live outside us — a holiday, a different job, one more cup of coffee. But there's a far more powerful one that goes everywhere you go, costs nothing, and works in under a minute. You're using it right now without thinking about it.

Your breath is the only part of the autonomic nervous system — the automatic machinery that runs your heart rate, digestion and stress response — that you can take manual control of at will. That makes it a kind of remote control for your physiology. In the Transforming Stress episode with breath master Tabatha DeBruyn, Dr Ash explores how something this simple becomes a genuine superpower. Here's the practical version.

Why a slow breath calms you down

When stress rises, your sympathetic nervous system — "fight or flight" — speeds the breath up and makes it shallow. The good news is that the relationship runs both ways. Breathe slowly and, crucially, extend your exhale, and you stimulate the vagus nerve, the main highway of the parasympathetic "rest and digest" system. Your heart rate drops, your blood pressure eases, and the alarm signal to the brain quietens.

The single most useful fact about breathing for stress is this: the exhale is the brake. A long out-breath does more to calm you than a big in-breath. Most people, under pressure, do the opposite — they gasp in and hold. Reversing that is the whole game.

Three practices, from rescue to routine

1. The physiological sigh (for an acute spike). Take a normal breath in through the nose, then a second short sip of air on top to fully inflate the lungs, and let it all out slowly through the mouth. Two or three of these can take the edge off a stress surge within seconds. It's the fastest reset there is.

2. Box breathing (to steady before something hard). In for four, hold for four, out for four, hold for four. Repeat for a minute or two before a difficult conversation, a presentation, or walking through your own front door at the end of a long day. It's used by people who work under genuine pressure for a reason.

3. Coherent breathing (to build a calmer baseline). Breathe at roughly five to six breaths per minute — about five seconds in, five seconds out — for five to ten minutes a day. Done regularly, this doesn't just rescue you in the moment; it gradually shifts your resting state, so the same stressors land a little softer.

From a rescue tool to resilience

The mistake is to treat breathwork purely as a fire extinguisher — something you grab only when you're already in the red. That works, and it's worth knowing. But the deeper benefit comes from practice when you're fine. A few minutes a day, most days, trains your nervous system to find calm faster and hold it longer.

This is the "boiling frog" principle applied to your own physiology: by the time stress feels overwhelming, the water has been warming for a while. A daily breath practice is one of the cheapest, most portable ways to notice the temperature rising — and to bring it down before it boils over.

Key takeaways

• Your breath is the one consciously controllable lever on the autonomic nervous system.
• The exhale is the brake — lengthen the out-breath to calm down fast.
• Use the physiological sigh for acute spikes, box breathing before pressure, and coherent breathing daily to shift your baseline.
• Practise when you're calm, not only when you're stressed — that's what builds resilience.

If you'd like to go deeper, the full conversation with Tabatha DeBruyn is well worth your time — and if you're not sure where your own stress currently sits, the free 90-second self-check is a good place to start.