Follow Chris Navin:
Instagram: https://www.instagram.com/4starendurance
Facebook: http://fb.com/metabolicathlete
Linkedin: https://www.linkedin.com/company/4starendurance
YouTube: https://www.youtube.com/@4starendurance

www.4starendurance.com/coach-chris

Coach Chris Navin—triathlon & marathon coach, 400+ races, 50+ Iron-distance finishes, Team USA qualifier 25+ times—joins Dr. Marc Humbert and Dr. Cameron Garber to unpack how metabolic profiling turns guesswork into PRs. Chris shares his unlikely journey from certified ethical hacker to endurance coach, why most athletes train a little too hard and fuel a little too little, and how VO₂ testing (O₂ and CO₂) lets you individualize zones, nail fueling, avoid injuries, and even negative split your marathon. We dig into "level 1 vs. level 2" testing, long-form testing with CardioCoach™, zone-2 misconceptions, fat-max shifts, and Chris's Four-Star Endurance method (Plan, Test, Learn, Inspire) that helps everyday athletes perform like pros—often improving VO₂ max and race times with age.

What you'll learn

How to read a metabolic profile (fat/carb crossover, thresholds, fat-max) and turn it into training zones

Why running "easier" can make you faster (and lighter) on race day

The difference between level 1 (baseline VO₂ + zones) and level 2 (fueling-focused, event-specific) tests

Evidence-based fueling math for marathons and Iron-distance events (and why most bonk near mile ~18–20)

A simple rule to prevent injuries: don't raise volume and intensity at the same time

How to use devices/apps (Garmin, Connect IQ, Myzone) after you calibrate them with lab data

The Four-Star Endurance framework to keep athletes motivated long-term

Follow KORR:
Instagram: https://www.instagram.com/korrmedical/ 
Facebook: https://www.facebook.com/korrmedical/ 
LinkedIn: https://www.linkedin.com/company/korrmedical
https://korr.com/ 
Listen to the Metabolic Mastery Podcast:
Apple Podcast: https://podcasts.apple.com/us/podcast/metabolic-mastery/id1812972674 
Spotify: https://open.spotify.com/show/2sgLMFv1Z8DwEz87yUpapI?si=29a177a6c6ca4ed4 
YouTube: https://www.youtube.com/@korrmed/podcasts 
YouTube Music: https://music.youtube.com/playlist?list=PLVCRWXBDdFo_S0OeaAsPv8xTnfajTLc75&si=d4wVUA0jqajkbukB 
Amazon: https://music.amazon.com/podcasts/d76834b7-c11a-485f-8010-32b490d49e57/metabolic-mastery