Beyond endurance: yōjō x gROW Atlantic

As a GP, I understand the science behind vagus nerve stimulation. I know the vagus nerve is the body’s master regulator, that it connects the brain to the body, and that it governs that all-important shift from ‘fight-or-flight’ into ‘rest-and-digest’. I know the mechanism, but I don’t think I really expected the impact.

I definitely wasn’t prepared for how much of a difference I would feel.

How I yōjō

My routine is simple.

Every night, when I go to bed, I grab my yōjō. I apply the gel to the earpiece and pop it in my ear. I find a comfortable intensity and then just let the gentle electrical pulses do their thing.

I also use it during the day when I remember. This is becoming more frequent because the benefits have become harder to ignore.

The sensation took a little getting used to — little electrical zaps that you have to set to your comfort level — but it quickly became something I looked forward to rather than something I had to remind myself to do.

What surprised me most

Sleep. Sleep. Sleep.

I’ve always been someone who can lie awake, mind whirring, tossing and turning for hours before finally dropping off. In the first few days of using yōjō, I noticed I was falling asleep faster.

At first, I put this down to coincidence, a good few days, or a placebo effect. But now, several months in, I can say with confidence that it is none of these.

On the nights I use yōjō versus the nights I don’t, there is a noticeable difference.

My Garmin data backs this up, too: sleep quality has genuinely improved, not just my perception of it. And that matters to me as someone who values having objective data alongside improvements in how I feel.

Getting to sleep faster has been the biggest win.

Anyone who knows that particular frustration of lying in the dark, wide awake, brain refusing to switch off, will easily understand just how significant this has been.

A shift in how I think about my nervous system

Something I didn’t anticipate was how using yōjō would make me more intentional about my parasympathetic nervous system more broadly.

Understanding something intellectually and actively working on it are two different things. yōjō has brought vagal tone into my daily awareness in a way that’s spilled over into other habits.

I now use the physiological sigh regularly — a double inhale through the nose followed by a long exhale — which is one of the fastest ways to manually activate your parasympathetic nervous system. It’s the kind of technique I’ve always known about, but yōjō has made me more motivated to layer these practices together.

I feel more in control of my own nervous system regulation, and that feeling of agency is something I hadn’t expected to value as much as I do.

Would I recommend it?‍

I started this journey curious. I’m continuing it as a genuine convert.

Whether you’re someone who struggles to wind down at night, feels chronically overstimulated, or simply wants to feel more grounded in your own body, yōjō offers something that is both accessible and, in my experience, genuinely effective.

The science was always there. And now I’ve felt it for myself.

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You signed up for the gym. You bought the juicer. You downloaded the app, booked the class, and subscribed to the service. And then … life happened. Motivation dipped, the novelty wore off, and somehow three weeks passed without you doing the thing you genuinely, sincerely intended to do.

You are not alone. You are not lazy or lacking willpower. You are experiencing one of the most well-documented phenomena in health psychology: the intention-behavior gap.

What is the intention-behavior gap?

The intention-behavior gap describes the frustrating disconnect between wanting to do something and doing it consistently. While intentions are widely recognized as a direct determinant of behavior, they frequently fail to translate into action.

Just how big is this gap? Larger than most people expect.

Studies indicate that intentions account for 18 to 23% of the variance in behavior across a broad range of health contexts. Put another way: around 80% of our behavior is driven by factors other than our intentions. That is a sobering statistic, but understanding why it happens is the first step to doing something about it.

Motivation vs. volition

One of the most useful frameworks for understanding this process is the Health Action Process Approach (HAPA), developed by psychologist Ralf Schwarzer. HAPA proposes that the adoption, initiation, and maintenance of health behaviors involves a motivation phase and a volition phase. These are two genuinely different psychological processes, and they require different things from us.

In the motivation phase, something shifts in our thinking.

When we encounter external inputs — reading an article, receiving a medical diagnosis, or hearing about a friend’s experiences — our cognition changes. We form perceptions about our own personal risk of poor health, beliefs about the causes of illness or the effectiveness of different wellness strategies, and confidence in our ability to stop or start behaviors. These perceptions then form our intentions. And it often feels energizing, because this is the moment you decide to do something differently.

This motivational energy is also why the first actions feel relatively easy. Making a purchase or signing up for something are meaningful steps that require some motivation but relatively little ongoing effort. You do them once, they feel like progress, and that feeling is real.

But they are not the behavior itself.

The volition phase is where the real work begins. The adoption and maintenance of a behavior involves the development of self-regulatory skills and strategies. This is the phase most people underestimate and where most good intentions quietly expire.

Motivation gets you to the starting line, while volition gets you across it.

Why does volitional effort feel so hard?

The honest answer is that maintaining your new behavior competes with everything else in your life: habits that are already deeply embedded in your routine, the pull of immediate comfort, fluctuating energy and mood, and unexpected disruptions — not to mention the cognitive and physical effort it takes to remember the behavior and do it.

This is what is meant by self-regulation: your brain is having to override what it wants to do now in favor of what you planned to do.

Self-efficacy plays a central role here. When your belief in your own ability to carry out a behavior is low, you are more inclined to anticipate failure. This deepens your self-doubt and makes failure even more likely, in your mind. The effort and energy you were willing to put in to attempting the behavior dwindles.

The intention-behavior gap is not simply a matter of motivation running out. It is about whether you have the right tools to carry intention forward into consistent action, especially on the days when motivation is difficult to find.

Bridging the gap: what the science says actually works

1. Make a specific plan, not just a vague intention

One of the most robustly supported tools in behavior change science is implementation intention, a simple "if-then" plan developed by psychologist Peter Gollwitzer.

Rather than telling yourself "I'll do vagus nerve stimulation every day," you specify exactly when, where, and how: "If it's 9 pm and I'm sitting down to wind down, then I will use my yōjō vagus nerve stimulator for 30 minutes."

When you've made a specific if-then plan, your brain is essentially primed and ready. You notice the cue when it appears, and you already know exactly what to do next. No deliberating, no negotiating with yourself, no relying on willpower. The decision has already been made.

Essentially, you are outsourcing the decision to your environment rather than relying on in-the-moment willpower.

2. Plan for obstacles

Action planning is what you will do when things go smoothly. Coping planning prepares you for when they don't.

The idea is to imagine a scenario that will prevent you from performing your intended behavior and think of ways to cope with the situation so you still get to the behavior. Having a plan ready prevents a single disruption from derailing the whole effort.

For example: "If I work late and miss my exercise class, then I'll go for a walk before dinner."

3. Track your progress

Self-monitoring is one of the most consistently effective behavior change techniques identified in research. Interestingly, two things increase the likelihood of a person achieving a behavioral goal: being prompted to record behavior more frequently in a way others can see, and actively rather than passively tracking progress.

This doesn't need to be complicated. A simple habit tracker, a note in your phone, or the usage data in an app can all serve this purpose. What matters is creating a feedback loop: you see what you're doing (or not doing), and you can adjust accordingly.

4. Build self-efficacy by starting small

One of the most common reasons people abandon new behaviors is that they set themselves an unrealistically demanding starting point.

Every time we successfully perform a behavior, our confidence in our ability to do it again increases. Setting an easily achievable target to start sets us up for a series of small, early wins, giving us that “I got this” confidence that sustains effort over time.

Another way we can increase our self-efficacy is through positive self-talk. We are often our harshest critics, but the way we talk to ourselves about a behavior matters more than most people realize.

We believe what we hear ourselves say, so replacing “I always fail at this” with “I’m trying really hard and I know I can do it” directly strengthens self-efficacy, making you more likely to persist when things get difficult.

From effort to effortless — how behaviors become habits

Here is the genuinely good news: behaviors that currently require conscious effort do not have to stay that way.

With enough repetition in a consistent context, behaviors can become automatic. Your brain literally restructures itself to make the behavior less costly over time, gradually moving control from your conscious, decision-making mind to deeper, more automatic brain systems.

Early on, every repetition produces a noticeable gain in automaticity. Over time, these gains slow down until the behavior happens without much deliberate thought at all — like brushing your teeth.

Research by Phillippa Lally and colleagues at UCL found that this process takes an average of 66 days. Depending on the person and the behavior, it can take as few as 18 days to as many as 254.

The "21 days to build a habit" idea is a myth, but what isn’t is the fact that missing the occasional session doesn't derail the process. Automaticity resumes quickly after a slip.

If you can anchor your new behavior to an existing daily cue and make it something you have chosen for yourself rather than feel obliged to do, you are giving it the best possible conditions to stick.

Putting it all together

The intention-behavior gap is real, it's normal, and it affects almost everyone. But it is not insurmountable. The science points to a clear pathway.

1. Motivation sparks the intention.
2. Planning (both action planning and coping planning) bridges intention and behavior.
3. Self-monitoring keeps you honest and on track.
4. Self-efficacy — built through small, consistent wins — sustains effort.
5. And over weeks and months of repetition in a stable context, the behavior gradually shifts from something you have to consciously decide to do, to something that belongs to every day.

Whether it's daily vagus nerve stimulation, a new movement practice, or a dietary change, the right tools can help you turn your good intentions into a new habit.

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There is a particular kind of exhaustion that sleep doesn't fix. We all feel it. Taking time off to rest doesn’t help. Sipping the air along the coast doesn’t replenish. Reading under a willow tree and listening to a whip-poor-will brings only momentary lightness. Every day begins with dread and ends with another well, at least we got through it.

Who can be blamed for turning on oneself?

Is this another failure of mine? Is it a discipline problem? Is it a matter of better time management or positive thinking? Is it because I walked under a ladder that one time? Do I lack grit?

No.

In this case, what feels like a willpower problem is more often a physiological one. And at its center is something called “allostatic load”.

What is allostasis

Allostasis is your body’s adaptive system. It maintains stability through change.

The baseball player out in left field who has sensed something in the body language of the batter starts to jog forward, his eyes locked on the ball flying from the pitcher’s hand. When the ball eventually pops up into the air, the player is already in motion, already underneath it, mitt reaching. This is allostasis.

Allostasis is your body predicting demands and preparing for them. It is why you begin to shiver when you step into cold air — your body has sensed the change in environment, knows a sudden drop in body temperature is possible and dangerous, and so rapidly contracts and relaxes your muscles to generate heat.

Prediction and preparation. The aim is homeostasis — internal balance.

This makes allostasis extraordinarily effective under normal conditions. The problem is what happens when those conditions are no longer normal.

What happens to the game if, after catching the ball and tossing it back to the pitcher, the baseball player does not return to his original position and instead runs around after imaginary fly balls?

Where the system begins to fail

There is a physical cost to allostasis. Changing bodily processes and triggering actions to pre-emptively maintain homeostasis have consequences. If allostatic processes are activated too often or stay activated for long periods, these consequences accumulate.

Called allostatic load, this accumulation leads to inadequacy and dysfunction.

If an allostatic process is activated frequently and never shuts off, eventually the changes it affects will grow less and less appropriate, its abilities to respond to anticipated needs stunted.

Your body, still driven by the need for homeostasis, sets other allostatic processes going to compensate.

Allostatic load is very obvious in chronic stress.

Your stress response is fundamentally allostatic and can cause a lot of damage if it becomes dysregulated.

Stress and allostatic load

During a stress response, your body releases adrenaline, cortisol, and pro-inflammatory cytokines. These are not inherently harmful. In the context of a brief, genuine threat, they are precisely what keeps you alive.

Adrenaline sharpens focus and mobilizes energy. Cortisol sustains the response and modulates immune function. Pro-inflammatory cytokines coordinate the immune system's rapid activation.

Duration is the problem.

When cortisol remains chronically elevated, your cells begin to downregulate their sensitivity to it, a biological response to over-signaling. The immune system, which normally depends on cortisol as a brake, begins to lose that brake. The result is immune dysregulation, which typically manifests as chronic low-grade inflammation.

Chronic inflammation is thought to weaken the lining of your gut, weakening the barrier between your gut and your bloodstream. Inflammation also spreads like a rumor, only deepening the problem. Chronic stress is widely accepted as a major driver of noncommunicable conditions such as metabolic syndrome, cardiovascular disease, type 2 diabetes, chronic pain, and neurological conditions, including depression. A large UK Biobank study published in 2025, drawing on data from over 200,000 adults, found that allostatic load independently predicts cardiovascular risk.

This is how chronic stress becomes structural illness. And it isn’t your fault.

Why modern stress is a particular problem for this system

Your allostatic system evolved for a different threat landscape.

A predator appears. Adrenaline spikes. Cortisol sustains the response. You flee, or you fight. The threat resolves. The parasympathetic nervous system re-engages. Cortisol clears. The system resets.

The entire sequence from activation to recovery might take minutes.

Modern psychological stressors, however, seem never to resolve.

A difficult conversation with a manager, a delayed email, anxiety about financial instability, and low-level dread about the news all trigger your allostatic stress response. But then your body never gets the signal that the threat has passed. There’s always another email.

Whether the threat is a predator or a deadline, both converge on the same downstream stress response: the same hormones, the same physiological activation, the same suppression of recovery. Allostatic load is the result of an ancient adaptive system confronting conditions it was never designed for.

And you can feel it.

Wired by tired. Non-restorative sleep. And even the self-loathing, which one meets with the mantra of the modern world: work harder.

Why you can’t push through the accumulated load

The dominant cultural response to stress is effort.

“When the going gets tough, the tough get going”.

Work harder, focus more, manage time better. Sleep when you’re dead.

This response makes intuitive sense if stress is understood as a performance or discipline problem.

It is exactly the wrong response if stress is understood as a physiological state. This is what people often get wrong about burnout. They miscategorize it and so mistreat it.

When allostatic load is low, the stress response is appropriately calibrated. You engage, you recover, you adapt. This is what the system is designed for.

When allostatic load is high — when the failed shut-off pathway has been running for months, when inflammation is chronically elevated, when cortisol sensitivity is impaired — the system is already dysregulated.

Pushing harder does not clear the load. It adds to it.

When a system designed for recovery is never given the conditions to recover, trying harder means feeling worse.

What recovery actually means in this context

To reverse allostatic load, you need to allow your parasympathetic nervous system space and time to do its job. And this is why the vagus nerve is getting more focus these days.

It is the primary arm of your parasympathetic nervous system. You can read more about ‘The Wanderer’ here. Activating the vagus nerve more regularly provides that parasympathetic moment. Slow deep breathing activates the nerve, particularly extended exhalation.

Sleep is also helpful as it is the primary window during which cortisol clears and inflammatory markers reduce.

Social safety and perceived control appear to reduce the frequency of allostatic activation in the first place. The more often you’re around people you trust in environments you know, the less primed you are for predict and prepare.

Heart rate variability, or HRV, is one of the cleaner signals of whether you’re accumulating allostatic costs or shedding them.

HRV reflects the dynamic balance between stress and relaxation activity — a measure of how flexibly your autonomic nervous system responds rather than how rigidly it holds a fixed state.

Research shows that HRV declines with increasing allostatic load. Improving vagal tone and HRV over time may help reverse allostatic load, but the link is tenuous and an active area of research.

What now?

The person who turns on themselves — who counts the ladders they've walked under, who wonders if it's a grit problem — is not weak. They are doing the only thing that makes sense when no one has explained the biology.

Now you have a better explanation.

Allostatic load is real, it is measurable, and it responds to the right conditions. The body that accumulated it is the same body that knows how to recover from it. It just needs to be given the chance.

Give your body a chance with yōjō.

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