Lesson 5: Yoga and the Nervous System: Stress, Resilience, and Why It Helps

Up to now, we’ve spoken about yoga as a living tradition. Something that evolved to help human beings meet life with more clarity and steadiness. In this module, I want to show you how modern science helps explain why yoga works. Not to reduce yoga to biology, but to support and strengthen what the tradition has always pointed towards.

The nervous system in simple terms!!!

At the centre of this conversation is the nervous system. Very simply, your nervous system is constantly asking one question. Am I safe, or am I under threat? When it senses threat, real or perceived, the body moves into what’s called a sympathetic state. This is often known fight or flight.

Heart rate increases.
Breathing becomes shallow.
Muscles brace.
Attention narrows.

When it senses safety, the body shifts toward a parasympathetic state. This is where rest, recovery, digestion, learning, and emotional regulation happen. Neither state is wrong. The problem isn’t stress. The problem is getting stuck. For many people, modern life keeps the nervous system on constant low-level alert. Emails. Notifications. Deadlines. News. Social pressure. The body doesn’t distinguish very well between a real physical threat and a psychological one. Over time, this creates tension, fatigue, irritability, anxiety, and a sense of being overwhelmed. This is where yoga becomes deeply relevant.

The Window of Tolerance

There’s a useful concept in psychology called the window of tolerance. This describes the range within which you can experience stress, emotion, and challenge without becoming overwhelmed or shutting down.

It says that we all have a window or range of stress that we can tolerate in a healthy way. When you’re within your window, you can think clearly.
You can feel emotions without being consumed by them.
You can respond rather than react.

When you’re outside it, things change. Above the window, there’s agitation, anxiety, anger. Below it, there’s numbness, withdrawal, collapse.

Yoga, when taught well, helps expand this window.

How yoga actually helps

Yoga does this in a few key ways. Through movement, it helps the body release chronic tension and restore a sense of safety in motion. Through breath, it directly influences the nervous system, either intestinally stimulating or consciously slowing down and regulating arousal. Through attention and awareness, it trains you to notice sensation, thought, and emotion without immediately reacting.

Over time, this builds resilience. Not by avoiding stress, but by increasing your capacity to be with it.

Presence, awareness, and emotional resilience

This is why yoga is not just about relaxation. It’s about learning to stay present in a wide range of experiences. You learn what activation feels like in the body. You learn what settling feels like.
And you learn how to move between the two with more choice. That skill carries directly into daily life.

Difficult conversations.
Unexpected challenges.
Moments of pressure.

Instead of being hijacked by automatic reactions, you have a little more space.

What the research shows

Modern research supports this understanding. Studies on meditation and contemplative practice, including work by Dr Sara Lazar, show changes in brain areas linked to emotional regulation, attention, and stress response. This doesn’t mean yoga turns you into someone who never struggles. It means you become better equipped to meet struggle without losing yourself in it.

Gentle reflection

I’ll offer you something to reflect on here.

When you feel stressed or overwhelmed, do you tend to speed up, or shut down?

Just noticing that pattern is already part of the practice.

In the next module, we’ll bring this understanding into the physical practice itself.

We’ll look at how some common cues and ideas in yoga classes no longer match what we know about the body, and why updating the way we teach posture is essential for long-term health.

FAQ’S

How does yoga help with stress?
Yoga may help people respond differently to stress through movement, breath, and awareness practices that support recovery and regulation.

What is the window of tolerance?
It is a model describing the range in which a person can stay present and regulated without tipping into overwhelm or shutdown.

Is yoga just for relaxation?
No. Yoga may also help build resilience, awareness, and the ability to move between activation and settling with more choice.

Is there research behind yoga and the nervous system?
Yes, though the quality and type of evidence vary. Research on yoga, mindfulness, and diaphragmatic breathing suggests benefits for stress, attention, and emotional regulation.