The Resilient Engine
Reading the gauge is not training the engine.
Almost everyone now has heart rate variability on their wrist. Very few have been given anything to do about it. This is the other half: a training model for the autonomic nervous system, and an app that runs it.
Why this exists
The wearable industry took the measurement and left the intervention behind.
The number goes up, the number goes down, and the person wearing it is left to guess what it means and what, if anything, should change. A gauge is not a training program. Knowing your resting heart rate has never made anyone fitter.
The intervention model inside the Resilient Engine is Nervous System Resiliency Training, or NSRT. It is a structured, protocol driven discipline grounded in two decades of research in psychophysiology, applied behavioral medicine, and HRV biofeedback. Not a technique, not a tradition, and not a hack.
The nervous system is the most under-trained system in human performance.
The instrument
Two minutes each morning, and the training has somewhere to live.
Measure your nervous system from the phone camera or a chest strap. Train it with paced breathing scored breath by breath. Watch the adaptation show up across months in your own data.
Measure
Clinical grade HRVHeart rate, RMSSD, SDNN and the full power spectrum with your breathing rate marked on it. The same measures behind the reports produced in the practice.
Train
Every breath scoredResonance breathing with a pacer that scores each breath while you take it, so you learn what resonance feels like rather than reading about it afterwards.
Ask
Dr. Jay AIBuilt from my own published work and able to see your readings, for the question that arrives at eleven at night.
Review
Reports I read firstWeekly and monthly reviews built from your own history. The app writes the numbers. I decide whether what they are saying is right.
What it measures
Real physiology, and none of it graded against a stranger.
Every reference range in the app is your own history. There are no population norms anywhere in it, which is a deliberate clinical stance rather than a missing feature.
The headline measure, and the one where lower is better. Under 8% is stable, 8 to 15% is caution, above 15% is high.
Beat to beat variation, the standard index of parasympathetic activity, alongside SDNN, lnRMSSD and pNN50.
Around six breaths a minute, where heart rate and breath move as one and the oscillation loads the baroreflex.
VLF, LF and HF bands with your own breathing rate marked on the curve, the same output behind the clinical reports.
A reading that cannot be cleaned into a real number is never stored. If more than 15% of beats jump, the app asks for a re-measure rather than filing a placeholder you might later mistake for data.
The model behind it
One substrate. Two axes. One adaptation.
Built the way exercise physiology builds anything else: a target adaptation, a primary stimulus, a measurement system, and a progression logic.
The speed and precision with which your nervous system moves between sympathetic activation and parasympathetic recovery. Not a mood and not a mindset. A measurable physiological capacity.
Trains the nervous system through targeted physiological stimuli.
Primary stimulusResonance frequency breathing
Trains the nervous system through attention, treated as a physiological signal.
Primary practiceMental Attunement Training
Not another pillar and not an equal partner. The foundation the rest is built on.
Sequence matters. Bottom up comes first, because the capacity to attend usefully to your internal state depends on having an internal state regulated enough to be worth attending to. Read the full model.
Who built it
Twenty years of psychophysiology, and the clinic it came out of.
Board certifications
Heart rate variability biofeedback and peripheral biofeedback. Dr. Jay T. Wiles is a clinical health and performance psychologist.
Professional leagues
Athletes across MLB, NFL, NHL, PGA, LPGA, ATP, WTA and MLS, plus Olympic medalists.
Media appearances
Podcasts, long form interviews and press. Founder of Thrive Wellness and Performance, co-founder of Hanu Health.
Where to next
Three ways in.
Use it yourself
The app, the morning check, the breathing training, and the reports. For anyone who wants to train the system rather than watch it.
The app →License the engine
For functional medicine clinics and health technology companies who want validated HRV measurement and intervention inside their own product.
For clinics →Watch and listen
The podcast and the channel, where the model gets argued out at length. Plus every long form interview worth keeping.
Media →Request access
The app is in limited release.
It is running with clients in the practice now and opening in stages. Leave your email and you will hear from me directly when a place is available, along with the occasional note on the model as it develops.
No sequence of sales emails. I write when there is something worth saying.