Activate Your Parasympathetic System: Why Your Body Won't Settle
Updated: Sep 30
And what you can do about it
You know the feeling: the workday is technically over, you're sitting on the sofa — and your mind keeps racing anyway. Your body is tense, your breath shallow, your jaw clenched. You know you should relax. But your body simply won't go along with it.
That is not a sign of weakness. That is biology.
Behind this phenomenon are two of the most important systems in your body: the sympathetic and the parasympathetic nervous system. Understanding how these two counterparts work gives you the first key to lasting nervous system regulation.
THE SCIENCE
The autonomic nervous system: accelerator and brake
The autonomic nervous system (ANS) governs every unconscious bodily function: heartbeat, breathing, digestion, immune system. It works around the clock without you having to intervene. It consists of two main branches that work like the accelerator and the brake of a car: the sympathetic and the parasympathetic nervous system.
In a healthy, regulated nervous system these two alternate flexibly. After a challenge the sympathetic system activates — and once the situation is over, the parasympathetic takes over and brings you back to rest. Under chronic stress the system loses that flexibility. The accelerator stays pressed down, even when there is no real danger left.
The sympathetic system: your biological alarm
The sympathetic system is also called the "fight-or-flight" system. It evolved to protect us from real danger: to escape a predator, react quickly, survive. When it activates, this is what happens in your body:
Heart rate rises
Breathing becomes faster and shallower
Cortisol and adrenaline are released
Muscles tense
Digestion is inhibited
Focus narrows onto the perceived threat
The problem in modern life: your nervous system doesn't distinguish between a predator and a full inbox. A difficult meeting, a deadline, a conflict with a colleague — physiologically, your body treats it the same way it treats a threat.
When that state becomes chronic, we speak of chronic stress or a dysregulated nervous system. The consequences: sleep problems, exhaustion, trouble concentrating, a weakened immune system — and over the long term, a higher risk of burnout.
The parasympathetic system: your built-in rest mode
The parasympathetic system is the counterpart to the sympathetic. It is also called the "rest-and-digest" system. When it is active:
The heartbeat slows
Breathing deepens
Muscles relax
Digestion is activated
Regeneration processes begin
A sense of safety and calm arises
The parasympathetic system is not passive — it is an active counterpart that moves your body into recovery mode. And here is what matters: you can engage it on purpose.
The vagus nerve: the bridge between head and body
One of the most important insights of modern neuroscience concerns the role of the vagus nerve. It is the longest nerve of the autonomic nervous system and connects the brain with almost every major organ: heart, lungs, gut.
The vagus nerve is the main carrier of the parasympathetic system. High vagal activity, measured as heart rate variability (HRV), is a marker of a well-regulated nervous system. It is associated with better emotional regulation, more resilience, and a higher tolerance for stress.
The good news: vagal activity can be trained. Through targeted somatic work — breath, body awareness, movement — we can stimulate the vagus nerve directly and engage the parasympathetic system.
THE SORE POINT
Why understanding alone isn't enough
Many women in business already have a deep cognitive understanding of stress. They read the books, listen to the podcasts, have the meditation apps, and do yoga. And still the body won't settle.
It was exactly the same for me. Alongside a packed business schedule, I tried to fit in sport, yoga, and meditation. I wanted to do it properly, I made time for it, I got up earlier to meditate — and I didn't realize that I was creating even more stress in my body, because of course I wanted to do all of that perfectly and correctly too.
The reason is that chronic stress isn't only a mental phenomenon.
The psychologist Peter Levine has shown in his work how unprocessed activation settles in the body. And the psychiatrist and trauma researcher Bessel van der Kolk puts it plainly: the body remembers. Cognitive insight alone cannot release these physical patterns. We need another route — through the body.
That is exactly the approach of the 3-Centers Method: we use the body as direct access to the nervous system, to loosen old patterns and build new capacity for calm and resilience.
SOMETHING FOR YOU TO TRY
How to engage your parasympathetic system
The extended exhale
The simplest and most effective way to stimulate the vagus nerve directly.
How to do it:
Breathe in deeply through your nose — count silently to 4
Pause briefly
Breathe out slowly — count silently to 8 (twice as long as the inhale)
Repeat 3–5 times
Why it works: the extended exhale engages the vagus nerve directly and sends a biological signal of safety to your brain. Slow breathing with an emphasized exhale measurably increases heart rate variability. You'll find more techniques in my article on breathing exercises for stress.
The sympathetic and parasympathetic systems are not fixed states. Your nervous system is neuroplastic — it changes through experience, through practice, through conscious body work.
What was once learned can also be changed. With the right tools, the right guidance, and above all with the understanding that real change doesn't begin in the head, but in the body.
Sources & further Reading
Porges, S.W. (2011). The Polyvagal Theory: Neurophysiological Foundations of Emotions, Attachment, Communication, and Self-Regulation. W.W. Norton & Company.
Van der Kolk, B. (2014). The Body Keeps the Score: Brain, Mind, and Body in the Healing of Trauma. Viking Press.
Levine, P.A. (2010). In an Unspoken Voice: How the Body Releases Trauma and Restores Goodness. North Atlantic Books.
Thayer, J.F. & Lane, R.D. (2009). Claude Bernard and the heart-brain connection: Further elaboration of a model of neurovisceral integration. Neuroscience & Biobehavioral Reviews, 33(2), 81–88.
Gerritsen, R.J.S. & Band, G.P.H. (2018). Breath of Life: The Respiratory Vagal Stimulation Model of Contemplative Activity. Frontiers in Human Neuroscience, 12, 397.
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