Performance Physiology Testing

Replace assumptions with physiology. Measure how your body actually produces energy so every training decision is built on evidence—not guesswork.

Resting Metabolic Rate (55 Seconds)

Discover how Resting Metabolic Rate testing reveals the number of calories your body burns each day before exercise. Whether your goal is improving performance, losing weight, or optimizing nutrition, it all begins by measuring—not estimating—your metabolism.

Schedule an RMR Assessment

VO₂ Max & Performance Thresholds

Watch Coach Diaz evaluate HYROX World Champion Hunter McIntyre while explaining how VO₂ Max testing identifies the metabolic transition points that determine training intensity, pacing, and performance.

Schedule VO₂ Testing

NOT SURE WHICH TEST YOU NEED?

Tell me what’s going on. I’ll review your goals, training history and current challenges and recommend the most appropriate next step.​

START MY ATHLETE ASSESSMENT →

Why Test With Coach Diaz?

Forty years of evaluating athletes—from first-time runners to world champions—has taught me one thing:

Performance isn’t the result of working harder. It’s the result of making better decisions.

Every assessment ends with practical recommendations you can immediately apply to your training.