What Is The Vagus Nerve — And Why Does It Matter For Your Yoga Practice?

You’ve probably heard the vagus nerve mentioned somewhere: a podcast, a breathwork class, a thread about nervous system regulation. It circulates as a wellness term without much explanation. Here’s the plain version:

What it is 

The vagus nerve is the longest nerve in the body. It runs from the brainstem through the throat, heart, lungs and gut: a two-way communication line between brain and body. About 80% of its signals travel upward: from body to brain (but not the other way around). Which means that the state of your body has more influence over your mental state than most of us were taught.

When the vagus nerve is well-toned, meaning it responds fluidly to stress and recovers quickly, you feel it as resilience. You can move through difficulty without staying stuck in it. When it’s under-toned, your nervous system stays in alert mode longer than it needs to. 

Why yoga reaches it

Several things that happen on a mat directly stimulate the vagus nerve. Slow, extended exhales activate it through the diaphragm. Gentle inversions like legs up the wall, and forward folds shift the body toward the parasympathetic state it governs. Humming, chanting, even an audible sigh stimulate it through the throat. And long, supported holds give your nervous system enough time to actually downregulate, rather than just visit calm briefly before snapping back.

This is why a restorative practice can feel disproportionately powerful relative to its effort level. In a restorative practice, you are not just stretching, but you're also giving the vagus nerve the conditions it needs to do its job.

Three things to try

1. Extended exhale. Inhale for four counts, exhale for eight. Try to do this two minutes before anything else in your practice. 
2. Legs up the wall for eight minutes. The vagal response takes longer than most people give it.
3. An audible exhale. A loud sigh, a hum, an Aum on the out-breath.