14 Sep 2026 12:00
HRV, Vagal Nerve Training & Nervous System Recovery with Matt Bennett
HRV, vagal nerve training, and nervous system recovery are having a real moment — but most people using a wearable to track any of it don't actually know what the data means or how to act on it. Matt Bennett, founder of Optimal HRV and a former mental health therapist specializing in complex trauma, joins Freddie to explain what heart rate variability is really measuring, how resonance frequency breathing trains the vagal nerve directly, and why a validated baseline matters more than any single readiness score.
They get into RMSSD vs. SDNN vs. high frequency HRV, the science behind resonance frequency breathing, and how vagal nerve training works like a strength practice — the more you do it, the more resilient your nervous system recovery becomes. Freddie and Matt also cover the everyday levers that move HRV most: alcohol, sleep consistency, fasting windows, walking, and nasal breathing. Matt closes out with how clinicians, coaches, and military performance teams use HRV data differently than the average wearable user, and why he built Optimal HRV to make vagal nerve training and nervous system recovery accessible at every price point.
Podcast Highlights:0:00 – Welcome Matt Bennett & Freddie's Optimal HRV experience2:01 – Matt's path into wellness: mental health therapy & complex trauma4:04 – The missing piece: quantifying nervous system healing6:23 – Partnering with a Harvard HRV researcher on resonance frequency breathing6:46 – HRV 101: what heart rate variability actually measures9:53 – Why the autonomic nervous system runs the whole show10:03 – Is low HRV always bad? Population norms explained12:32 – Can HRV be too high? Pacemakers, beta blockers & outliers14:18 – Freddie's data: fasting windows, exosomes & recovery spikes15:17 – The real cost of alcohol on HRV18:36 – Sleep consistency, cold plunge timing & circadian cues21:03 – The four pillars: sleep, nutrition, movement, breathing23:25 – Nasal & diaphragmatic breathing vs. mouth/chest breathing24:33 – Sprint intervals, Carol Bike & low-tax cardio25:30 – Finding movement that fits your life28:12 – Why hiking is Matt's HRV sweet spot28:41 – Readiness scores: are Whoop, Oura & Garmin actually valid?31:23 – RMSSD, SDNN & high frequency HRV, explained simply36:48 – The one metric to track if you only track one37:11 – What makes Optimal HRV different from a wearable39:19 – Resonance frequency breathing & finding your number41:30 – The vagal break: training your nervous system like a muscle45:17 – What strengthening the vagal break actually changes49:13 – Pricing, compatible devices & getting started53:16 – How much daily practice actually moves the needle58:01 – Resonance breathing for sleep, performance & flow state1:04:29 – How clinicians, coaches & military teams use this data1:08:43 – Device compatibility & where to start1:11:09 – Closing thoughts & where to find Optimal HRV
Try Optimal HRV: https://www.optimalhrv.com/
Connect with Optimal HRV on socials: https://www.instagram.com/optimalhrv/
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