HRV, vagal nerve training, and nervous system recovery are having a real moment — but most people wearing a tracker have no idea what the data actually means or what to do with it. Freddie sits down with Matt Bennett — founder of Optimal HRV and a former mental health therapist specializing in complex trauma — to unpack what heart rate variability really measures, why a validated personal baseline matters more than any single readiness score, and how resonance frequency breathing trains the vagal nerve directly.

They get into RMSSD vs. SDNN vs. high frequency HRV, why “higher is always better” isn’t the full picture, 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 read HRV data differently than the average wearable user, and why he built Optimal HRV to make vagal nerve training accessible at every price point.

Note: this conversation covers emerging research and technology. Some figures and studies mentioned reflect the guest’s own citations and firsthand experience shared in conversation.

Connect with Matt

Try Optimal HRV: https://www.optimalhrv.com/

Optimal HRV Monitor 2.0: View the monitor

Instagram: https://www.instagram.com/optimalhrv/

Upgrade your wellness

LightPathLED Red Light Therapy: https://bit.ly/4gwYiUh

Code: beautifullybroken

Explore Aurawell PEMF and Magnawave:

https://calendly.com/freddiekimmel/aurawellpemf

Silver Biotics Wound Healing Gel: https://bit.ly/3JnxyDD

30% off with Code: BEAUTIFULLYBROKEN

MaxGen Labs: https://maxgenlabs.com/BEAUTIFULLYBROKEN

Connect with Freddie

Work with Me: https://www.beautifullybroken.world/biological-blueprint

Website and Store: https://freddiekimmel.com/

Instagram: https://www.instagram.com/freddie.kimmel/

YouTube: https://www.youtube.com/@beautifullybrokenworld

Book a Call: https://calendly.com/freddiekimmel/wellness-concierge-clone

Episode highlights

00:00 Intro 01:49 Welcome Matt Bennett & Freddie's Optimal HRV experience 03:50 Matt's path into wellness: mental health therapy & complex trauma 05:53 The missing piece: quantifying nervous system healing 08:12 Partnering with a Harvard HRV researcher on resonance frequency breathing 08:35 HRV 101: what heart rate variability actually measures 11:42 Why the autonomic nervous system runs the whole show 11:52 Is low HRV always bad? Population norms explained 14:21 Can HRV be too high? Pacemakers, beta blockers & outliers 16:07 Freddie's data: fasting windows, exosomes & recovery spikes 17:06 The real cost of alcohol on HRV 20:25 Sleep consistency, cold plunge timing & circadian cues 22:52 The four pillars: sleep, nutrition, movement, breathing 25:14 Nasal & diaphragmatic breathing vs. mouth/chest breathing 26:22 Sprint intervals, Carol Bike & low-tax cardio 27:19 Finding movement that fits your life 30:01 Why hiking is Matt's HRV sweet spot 30:30 Readiness scores: are Whoop, Oura & Garmin actually valid? 33:12 RMSSD, SDNN & high frequency HRV, explained simply 38:37 The one metric to track if you only track one 39:00 What makes Optimal HRV different from a wearable 41:08 Resonance frequency breathing & finding your number 43:19 The vagal break: training your nervous system like a muscle 47:06 What strengthening the vagal break actually changes 51:02 Pricing, compatible devices & getting started 55:05 How much daily practice actually moves the needle 59:50 Resonance breathing for sleep, performance & flow state 01:06:18 How clinicians, coaches & military teams use this data 01:10:32 Device compatibility & where to start 01:12:58 Closing thoughts & where to find Optimal HRV

Read the full transcript

Click to open

⌄

WORK WITH FREDDIE

Someone in your corner who has been through it

Two calls a month, real email replies, and a plan to drive real health results.

See how it works

MENTIONED IN THIS EPISODE

The gear and protocols we talked about

5% off

BEAUTIFULLYBROKEN

Lightpath LED

Red Light Phototherapy will enable you to enjoy relief from the discomfort associated with sports-related injury and arthritis. Great for alleviating post-operative pain. Numerous clinical studies have demonstrated a wide range of natural health benefits from red light therapy.

15% Off

BEAUTIFULLYBROKEN

Silver Biotics

Keeping our bodies strong is essential to good health. Astrong immune system can protect your body and helps us heal. Also, the most incredible toothpaste I've ever used.

Aurawell PEMF Device

AuraWell offers two FDA-cleared paths to recovery: the Aura Wave , a compact ~4,700-Gauss device built for daily at-home use, and the Nova HD+ , a higher-capacity ~2,700-Gauss system designed for more flexible, heavier-duty sessions. Both use the same NASA-rooted PEMF science trusted by NFL, MLB, and Olympic programs to support circulation, recovery, and muscle/joint relief. The right one comes down to whether you want grab-and-go simplicity or broader session flexibility.

Gupta Program

The Gupta Program is committed to an evidence-based approach for treating chronic conditions. Over the last 20 years, numerous research studies, including randomized controlled trials, have demonstrated that The Gupta Program is highly effective in treating various chronic conditions. An international audit, conducted by an independent research firm, demonstrated across 16 different chronic conditions that after 3+ months of using The Gupta Program participants experienced a significant increase in overall health and functioning. (These findings were presented at the 2023 IACFS/ME Conference and are being submitted for publication.)

MaxGen Labs

MaxGen Lab was created by practicing physicians to provide a safe, accurate, and easy-to-understand way for people to learn about their bodies. Our reports are based on cutting-edge research, trusted by hundreds of physicians worldwide, and have received rave reviews and success stories. All of our reports contain actionable steps with easy-to-understand and implement results. Our simple and precise DNA tests have helped thousands of individuals make more proactive choices toward optimal health and healing.