Flex Diet Podcast

Can short bursts of hard cardio outperform hours of Zone 2 for the average person? Exercise physiologist Dr. Martin Gibala explains how HIIT can improve VO2 max and metabolic flexibility, why elite athletes' 80/20 split may not fit a time-strapped schedule, and how to judge vigorous effort without chasing a perfect heart-rate zone.

Whole-body MRI promises a detailed look under the hood—but what can a quick screening scan actually see, miss, and send you chasing? Diagnostic radiologist Dr. Paul Clemons explains why a whole-body MRI is a limited study, how incidental findings can lead to further tests, and why standard screening remains the better choice for most people. Paul and Mike also compare MRI, CT, PET, and DEXA; unpack contrast, radiation, scan safety, and pacemakers; and discuss why a dramatic spine image does not automatically explain pain or point straight to surgery.

Dean Guedo and Jeb Stuart Johnston (the Food on the Mind duo) join Dr. Mike T Nelson for their yearly AI check-in, getting into whether creators should disclose AI use and why deepfaked video is a very different beast than AI-assisted writing. The conversation ranges into dead internet theory, why so much hard-won fitness expertise never made it onto the internet at all, and why demanding physical skills may become more valuable, not less, as AI accelerates.

Don Saladino has spent nearly three decades training A-list stars like Ryan Reynolds and Hugh Jackman -- and here he shares the single business lesson he wishes he'd learned sooner. He and Dr. Mike also dig into why Don closed his $2M-overhead NYC gym, how tracking respiratory rate reshaped his approach to Zone 2 training, and the sobering personal loss that changed how he views performance enhancers.

Dr. Ben Skutnik (PhD, CSCS*D) joins the show to separate fact from fad in aerobic training, debunking zone 2 hype and explaining why VO2 max matters but isn't everything. We also dig into the psychology of performance, why anecdote often outruns research, and how 'closing the loop' with clients beats chasing mechanisms.