Joel Jamieson: How to Use HRV, Zone 2, & VO2 Max to Train Smarter

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What if the fitness metrics you’re obsessing over aren’t telling you what you think they are? HRV. VO2 max. Resting heart rate. Zone 2. Wearables have given us more data than ever… but do you know how to use it to inform your training?

In this episode of the Ready State Podcast, Kelly and Juliet Starrett sit down with renowned strength and conditioning coach Joel Jamieson to cut through the noise around cardiovascular fitness, recovery, and resilience. Drawing on more than 25 years of experience coaching UFC champions, Olympic athletes, special operators, and professional sports teams, Joel explains why a higher HRV isn’t always “better,” what Zone 2 training is really trying to accomplish, and why your aerobic engine matters even if endurance sports aren’t your thing.

They also explore how to balance low, moderate, and high-intensity training, practical ways to measure whether your conditioning is actually improving, and why stress outside the gym has to factor into how you train. The takeaway? Better fitness isn’t about chasing a perfect score – but about understanding what your body can handle, how well it recovers, and how to train accordingly.

What You'll Learn in This Episode

• Why a higher HRV doesn’t always mean you’re better recovered
• What Zone 2 training is actually trying to accomplish
• Why cardiovascular fitness is important for improving resilience
• How to balance low, moderate, & high-intensity conditioning
• Why stress outside the gym should influence how you train

Key Highlights:

(00:00) Intro: Joel Jamieson on HRV & Conditioning

(03:33) The HRV Problem for Midlife Athletes

(05:13) What Is HRV?

(09:41) The Evolution of HRV Tracking

(13:32) What's a Good HRV?

(16:18) Morning vs Overnight HRV

(20:49) Why Higher HRV Isn't Always Better

(24:00) HRV, Resting Heart Rate, & Heart Rate Recovery

(26:50) Chest Strap vs Wrist-Based HRV

(29:33) How to Improve Your HRV

(34:10) How Fast Cardiovascular Fitness Declines

(37:53) Training Intensity Zones Explained

(43:30) Low, Moderate, & High Intensity Training

(45:59) Why Low-Intensity Training Builds VO2 Max

(48:33) Is VO2 Max Testing Worth It?

(51:04) The Cooper's Test

(55:09) How Fast Can Conditioning Improve?

(59:55) Team Athletes & Recovery

(1:01:46) Life Stress, HRV, & Training

(1:04:00) Lifestyle Sets Your Gym Limits

(1:05:21) Infinite Shelf

Huge thanks to our sponsors,Momentous, LMNT, and BEDGEAR.