The Heart of Resilience

On the Science of Coming Back to Yourself

A Personal Note Before We Begin

I confess — historically, I have not been the most resilient person. I’m more resilient now than I’ve ever been, but still not where I’d like to be, even though I work on it every day. This may not be what most people expect to hear from a Self Leadership & Resilience Coach, but it’s the truth.

My past is checkered with anxiety and depression and the trauma left within me. I would take a hit and not only go down — I’d stay down. And a hit could be something that most people wouldn’t even register as a drain on their system. I’ve needed to build my resilience deliberately, and work on it consistently, in ways that have genuinely mattered to my life. I share that not as a disclaimer, but as context. The person writing this piece has lived what it describes.

I hope something here helps you make sense of your own emotions, states, and patterns — and points toward what’s actually possible.

What This Piece Covers

This article does three things. First, it offers two complementary definitions of resilience — one physiological, one personal — so we can get to the real heart of what it means. Second, it blends two models — Polyvagal Theory and the Window of Tolerance — to give you a felt sense of your own relationship with resilience, and what might be worth changing. Third, it explores the heart itself — both as a physiological instrument and as a relational one — and how we can leverage it in mind-body practices and in connection with others to genuinely cultivate resilience over time.

A note on the title: I originally wrote this piece in 2021, mid-pandemic, to educate about the power of the heart — its rhythms, its intelligence, and its central role in the science of returning to ourselves. That’s what The Heart of Resilience means here.

In this piece:

What resilience actually means — and why bouncing back is only part of the story?
The Polyvagal Theory and your autonomic nervous system
Neuroception — how your body detects danger before you do
Stressors, triggers, and what actually activates us today
The Window of Tolerance and your range of resilience
Heart Rate Variability and coherence
Using your heart to build resilience — practices and connection

What is Resilience?

Stephen Porges, creator of the Polyvagal Theory, defines resilience as the capacity to rapidly return to an autonomic state of calmness following a challenge — specifically, to return to the Social Engagement System, the state in which we feel genuinely safe.

The HeartMath Institute defines it as the capacity to prepare for, recover from, and adapt in the face of stress, challenge, or adversity. I’d add: so that we can not only survive, but flourish and thrive.

The definition I use with my own clients brings both together:

Resilience is the capacity to return to your Authentic Self — in a state of calm and alignment — after challenges, adversity, stress, pain, or setbacks. Not once and for all, but repeatedly.

These definitions are clear and elegant. But the reality of resilience is more complex and more personal than any definition captures.

Real resilience isn’t just bouncing back from a single blow. Life is often full of sustained, enduring stress — not one-time events but ongoing pressures, chronic adversity, relentless demands.

A complete picture of resilience has to include the capacity to remain within a zone of wellbeing even under sustained arousal — to stay connected to ourselves and others, to keep functioning, to keep being who we are — while the pressure continues. Not everyone is built that way by default. And each person brings something deeply personal to this story: their nervous system, and their history.

We can explore this through the lens of one of the most important scientific frameworks of the last thirty years.

The Polyvagal Theory: A Brief Primer 

The Polyvagal Theory is Stephen Porges’s life’s work, and can be summarized simply as the science of inner safety. It describes an autonomic nervous system that is continuously influenced by signals from both the external environment and our inner world — and that responds to those signals in a predictable, hierarchical way, with one primary goal: to keep us safe, and ultimately, to support our flourishing and social connection.

The theory is called polyvagal because it centers on the functions of the tenth cranial nerve — the vagus nerve, sometimes called the wandering nerve — which has two main branches. The Ventral Vagus connects from the brainstem to the heart and lungs, governing the organs above the diaphragm. The Dorsal Vagus reaches further down, governing the organs below it. Each branch plays a distinct and critical role in how we respond to the world.

The nervous system is genuinely complex. What follows is a simplified model — enough to help you understand your own basic architecture, track what happens to you as you move through stress cycles, and recognize who you become in different states.

The Autonomic Nervous System (ANS)

The part of our nervous system we’re focusing on is the Autonomic Nervous System — the ANS — which governs all the automatic, unconscious functions of the body: heartbeat, digestion, temperature regulation, cellular repair, and so on. It also regulates our stress response: what happens to our bodies, minds, and emotions when the system detects danger and mobilizes to protect us.

Most of us learned that the ANS has two main branches — the Sympathetic and Parasympathetic systems. Polyvagal Theory adds critical nuance to that picture by identifying a third state we live in: the Social Engagement System. To make this easier to follow, think of the ANS like a car with three controls: a gas pedal, a foot brake, and an emergency brake.

From here on, I’ll use some acronyms – so this might help:

The Sympathetic Nervous System (SNS) — The Gas Pedal

The SNS mobilizes energy. It gets us moving. When the system detects danger, the SNS activates the fight-or-flight response — redirecting energy away from non-essential functions like digestion and immunity, toward the muscles, heart, and organs that need it most for survival. It’s a remarkable system, exquisitely designed for exactly what it was built to do.

The Parasympathetic Nervous System — Ventral Vagus — The Foot Brake

The ventral branch of the Parasympathetic Nervous System is the foot brake. It slows things down, regulates and offsets the stress response, and allows the body to restore the functions that survival mode had suspended — digestion, immunity, repair, and crucially, the capacity for social connection. This is the Social Engagement System (SES): the state of safety, openness, presence, and genuine connection with others. It is the state in which we grow, heal, and thrive.

The Dorsal Vagus — The Emergency Brake

The dorsal vagus is the emergency brake — the oldest branch of the autonomic nervous system, evolutionarily speaking. When threat is overwhelming and neither fight nor flight is possible, the dorsal vagus initiates a freeze or shutdown response: immobilization, conservation of energy, dissociation.

Our evolutionary ancestors needed this response when their only survival option was to go still — like a rabbit freezing in place, or an animal feigning death. It exists on a spectrum, from momentary blankness or loss of words at one end, to prolonged depression and shutdown at the other.

(The graphic by therapist Ruby Jo Walker, which maps the three states of the ANS and their associated inner experiences, is one of the clearest visual representations of this I’ve encountered — worth seeking out if you want to see this mapped.)

Neuroception: Your Body’s Threat Detection System

Running beneath conscious awareness at all times is a threat detection process Porges calls neuroception — the body’s continuous, unconscious scanning of the environment and our inner world for signals of safety or danger.

With a neuroception of safety, we remain in the Social Engagement System — feeling connected, calm, open, present, and compassionate. Essentially all the states that make life feel rich and worth living.

The moment the body detects real or perceived danger — and it’s important to note that a thought alone can trigger a genuine stress response — the ventral brake releases and the SNS activates. We may feel anything from mild tension or irritation to full panic or rage, depending on the intensity of the perceived threat and our own history and baseline.

In survival terms, avoidance is the most efficient first response — not cowardice, just good design. But when avoidance isn’t possible, the system moves toward fight: annoyance, irritation, anger, the baring of teeth. And when the threat is prolonged, or beyond our perceived capacity to cope, the dorsal vagus initiates shutdown: helplessness, hopelessness, numbness, dissociation, depression. The gas and the brake are both fully pressed at once.

If the threatening situation eventually resolves, recovery doesn’t happen in a straight line. The body must pass back through sympathetic activation before returning to the SES — a deactivation cycle that can feel alarming enough to send someone back into shutdown before they make it home.

None of this is a conscious choice. The nervous system is doing it on our behalf, using the survival logic it has accumulated across a lifetime.

I’ve taken another graphic from therapist and human-equine trauma recovery trainer, Sarah Schlote, and flipped it upside down to tell the same story from a different perspective.

In the Social Engagement System, life feels expansive, open, and free. We are in our best selves — in Self, in the language of Self Leadership: calm, curious, compassionate, creative, courageous, connected. The ventral vagus is active and we feel genuinely safe. We can be aroused without fear — in play, sport, or challenge — and still without fear — in intimacy, meditation, or quiet presence. But we don’t jump abruptly from safe to threatened. The graphic shows gradients: a slow movement from green through yellow toward red. As danger increases — as neuroception reads the situation as beyond our capacity to cope — our world begins to contract.

Flipped upside down, the image captures something viscerally true: the expansive feeling of safety narrows into a grip, a choking constriction, a steep hill that gets harder to climb back up the further down we go.

Stressors, Triggers, and What Actually Activates Us Today

We can skip the sabre-tooth tiger scenarios. What stresses us today is more subtle, more social, and in many ways more relentless than anything our ancestors faced.

What activates our stress response is anything we unconsciously assess as beyond our capacity to cope. A simple thought — of sharing an honest opinion, of being judged, of losing someone’s approval — can be enough to trigger a genuine physiological stress response, particularly when belonging and safety feel closely tied together.

For many people, the office itself is a chronic stressor. The pressure, the culture, the politics, the constant performance — all of it can keep the nervous system in low-grade sympathetic activation for hours each day, every day. Add that to what people carry from home, and the cumulative load becomes enormous.

Chronic stress means the body is not healing, not restoring, not digesting properly. Immune function is compromised. The prefrontal cortex — responsible for deliberate thought, nuanced judgment, and executive function — is genuinely impaired. Under sustained stress, we literally cannot think as clearly as we can in safety. Which makes everything feel harder. Which creates more stress.

So we adapt. We find ways to cope — some helpful, some not. We seek co-regulation through connection. We fawn, appease, and people-please to reduce the threat of others’ disapproval. We turn to substances, screens, or behaviors that offer temporary relief and over time become habits or addictions. We go into flight, then fight. Some people bypass flight entirely and move straight to fight — the person who can’t receive any critical feedback without a disproportionate emotional response, the one who dominates and pushes others around as a non-physical form of aggression.

Where we go, and what gets triggered in us, comes largely from our history — especially childhood. The experiences we had, and crucially, whether we had attuned, caring caregivers who could co-regulate with us and help our nervous systems return to safety, set our baseline and range of resilience for life. Adverse and traumatic experiences, which are far more common and everyday than we typically acknowledge, as well as chronic unresolved stress, can dysregulate the system and shift that baseline significantly — even in adulthood.

The Window of Tolerance

Neuroscientist Daniel Siegel proposed a model he called the Window of Tolerance — a zone of arousal within which we can function effectively, sometimes also called the Zone of Optimal Arousal.

A healthy, well-regulated nervous system can tolerate meaningful amounts of sympathetic activation and return to parasympathetic rest and repair with relative ease — moving like a wave, up and down, without getting stuck in either direction. That window looks different for everyone. Some people have a wide, flexible window. Others have a narrow, contracted one. Some live habitually in higher arousal. Some in lower. This is their baseline.

For those with adverse childhood experiences, unresolved trauma, or chronic toxic stress, the window tends to be narrower and the system less flexible. Once triggered, they may get stuck in sympathetic activation — hyperarousal — for extended periods, feeling anxious, restless, hypervigilant, emotionally flooded, or chronically tense. Or they may collapse into hypoarousal — the dorsal vagal shutdown — feeling depressed, numb, disconnected, exhausted, and without hope.

Neither is a character flaw. Both are nervous system adaptations to experiences the system found overwhelming.

Expanding the Range of Resilience

For resilience, we want to expand that window — to increase our capacity to stay present and functional across a wider range of situations, without being so easily overwhelmed or shut down.

Part of this is external: responsibly, bravely, and with genuine self-compassion, reducing the chronic stressors in our lives. Leaving toxic environments. Setting limits on what we’re no longer willing to endure. Asserting our needs more clearly and more consistently. Ending or transforming relationships — especially our relationship with ourselves — that have become sources of chronic harm.

But the deeper work is internal — and it cannot be done from the top down. We cannot think or reason ourselves into a felt sense of safety. The body simply doesn’t believe us. Real change in our baseline requires working at the level of the nervous system itself: through the body, through practice, through relationship, and through the heart.

Which brings us to why this piece has the title it does.

Resilience and Self Leadership: The Same Return

There’s a connection worth naming explicitly between what Polyvagal Theory describes and what Self Leadership — the framework at the heart of my coaching practice — points toward.

In Polyvagal terms, the Social Engagement System is the state of physiological safety: the nervous system at rest, the body open, the capacity for genuine connection fully available. In Self Leadership terms, this is the state of Self — the calm, clear, curious, compassionate core of who we are that becomes accessible when our protective parts are no longer running the show.

These aren’t two separate things. They’re the same state described from two different vantage points — one neurobiological, one psychological. The felt sense of safety in the body is what makes access to Self possible. And the return to Self — through awareness, through parts work, through the steady practice of noticing and coming back — is one of the most powerful ways of restoring that felt sense of safety over time.

This is why resilience, in the HeartRich framework, isn’t treated as a standalone skill. It’s woven through every domain of Self Leadership — from presence and awareness, to regulation, to values-guided living. The capacity to return to yourself — through the heart, again and again, under pressure — that’s both the definition of resilience and the heart of what Self Leadership is for.

Explore the HeartRich Matrix Self Leadership Framework →

Heart Rate Variability & Coherence

Most people assume the heart beats at perfectly regular intervals — sixty beats per minute, one beat per second. It doesn’t. And it isn’t meant to.

When we inhale, the heart beats slightly faster. When we exhale, it slows. The variation in the intervals between beats is called Heart Rate Variability, or HRV — and it carries meaningful information that the brain and body are continuously responding to. This rhythm is mediated by the vagus nerve through a mechanism called respiratory sinus arrhythmia, which is one reason breathing practices have such direct physiological effects on our state.

When we’re in states of stress — anywhere in the sympathetic to dorsal spectrum — our HRV pattern becomes erratic, jagged, and chaotic. This is an incoherent state.

When we experience genuine positive emotion — when we’re in or close to the Social Engagement System — our HRV becomes smooth, rhythmic, and ordered. This is coherence: a state of psychophysiological harmony in which mind, body, and emotion are working together rather than against each other.

High HRV and high coherence are roughly equivalent to what Polyvagal Theory calls high vagal tone — the hallmark of a well-regulated, resilient nervous system. In this state, we are more clear-headed, more creative, more emotionally balanced, more compassionate, and more resourceful. Our immune function is better, our healing is faster, our capacity for genuine connection is greater. We are, to use an image I find useful, excellent surfers — riding the waves of arousal and always finding our way back to ourselves.

The remarkable thing is that we can influence this directly. We actually have meaningful conscious access to the process of creating coherence — which means we have more agency over our own physiological state than most of us realize.

Using the Heart to Build Resilience

The ventral vagus nerve is in direct contact with the heart and everything above the diaphragm. This means the heart isn’t just a pump — it’s a primary interface between our nervous system and our experience of safety, connection, and wellbeing.

In HeartRich Resilience Coaching, one of the core practices I teach is the Quick Coherence Technique, developed by the HeartMath Institute. It involves rhythmic breathing combined with a deliberate shift of attention to the area of the heart, while gently cultivating a heart-centered emotion — appreciation, gratitude, care, compassion, love.

It may sound simple. It is. But it’s also one of the most studied and most practically effective self-regulation practices available, applied across clinical, organizational, athletic, and educational contexts around the world.

It’s one of the most important practices I’ve ever learned and I use it daily — before difficult conversations, before presentations, in moments of activation, and simply as a way of returning to myself when I’ve drifted.

Try this now, if you’re willing: loosen your shoulders, take one slow breath in through your nose, hold it briefly, then extend the exhale as long as you comfortably can. Notice what shifts. That small movement — activating the parasympathetic system through the exhale — is the beginning of the practice.

(A video demonstration of the Quick Coherence Technique is available below.)

Activating the Heart for Connection

Many people naturally turn toward others when they’re scared, stressed, or sad. There’s deep wisdom in that instinct. The caring, attuned presence of another person — someone whose own ventral vagus is active, whose face is calm and open, whose voice carries warmth rather than threat — can help regulate our nervous system in ways we cannot always achieve alone. This is coregulation: the nervous system finding safety through proximity to another nervous system that is already safe.

When we feel genuinely seen, heard, and held by another person, something in us settles. The SES activates. We come home to ourselves through the presence of someone else, a safe other.

The reverse is also true. When we reach toward someone who is in sympathetic or dorsal dominance — activated, defended, or shut down — we may add dysregulation to dysregulation. We can trigger each other, escalate each other, or simply fail to reach each other across the gap between our respective states.

Some people, based on early attachment histories, don’t feel safe with other humans at all — but may feel safe with animals. There is nothing small about that. For many people, the co-regulatory relationship with a dog, a cat, or a horse is not a consolation prize but a genuine foundation for rebuilding the felt sense of safety that human connection hasn’t yet been able to offer.

The good news is that the capacity for connection can be cultivated — even if we begin alone, in the safety of solitude, building the internal conditions that eventually make external connection possible. Practices that support this include:

Time in nature. Heart-focused and rhythmic breathing. A wide range of other breathing and self-regulation practices. Deliberately nurturing positive emotion. Gratitude and appreciation practices. Loving-kindness meditation. Singing, chanting, or humming — all of which directly activate the vagus nerve. Gentle yoga and mindful movement. Some forms of exercise. Acts of kindness and contribution. Laughter. Prayer or connection to a loving source, however that’s understood. Tai chi and qigong. Calming music.

Summing Up

The heart of resilience — the true core of it — is the capacity to return to ourselves. To come back to a state of calm and alignment after challenge, adversity, stress, or pain. Not once and for all. Repeatedly. Each time a little more gracefully, a little more quickly, a little more fully.

That return is only possible when the body feels safe. And the heart — both the physiological organ and the metaphorical one — is at the center of how that safety is created, sustained, and shared.

Whatever your history, whatever your current range of resilience, this work is available to you. Not as a destination but as a practice. A daily returning. To Self. To safety. To your own heart — and to the hearts of others.

To explore what’s beneath the framework this sits within, visit The Lattice Beneath the Matrix →

Guy Reichard is a Self Leadership and Resilience Coach and the founder of HeartRich Coaching. He is the author of How to Talk Amongst Your Selves and The Heart of Values. If this resonated, you might start with the free Inner Crews Guide or the Who’s On Your Crew? Assessment.