Paul Oneid tore both quads and rebuilt himself from powerlifter to trail runner, with coach Cody Miller guiding the transition. They break down the emergent training approach, VO2 max and cardiac adaptations, and the mental side of suffering across strength sports and endurance.

Can you really build more muscle just by rethinking how you dose leucine and essential amino acids? Dr. Daniel A. Traylor, Ph.D. — co-founder and principal scientist of LEUVATE™ — reveals the science behind protein quality, muscle protein synthesis, and why older adults may need twice the protein dose to get the same results as younger people.

Dr. Mike T. Nelson explains why sleep—despite being a massive physiological lever—ranks last among the eight interventions in the Flex Diet Certification. The key concept: coaching leverage (physiology × psychology). Sleep scores high on physiology but rock-bottom on a client's ability to change, while protein scores high on both, making it the #1 starting point.

Dr. Sara Campbell returns to discuss her lab's cutting-edge research on the bidirectional relationship between exercise and the gut microbiome — including why consumer gut tests oversimplify a complex ecosystem, how antibiotics devastate exercise capacity in animal models, and why single-microbe probiotics miss the bigger picture of functional guilds. She also shares new findings on short-chain fatty acids, amino acid metabolomics after antibiotic treatment, and the emerging neuromuscular junction hypothesis.

Dr. Mike T. Nelson discusses how AI is shaping the coaching industry — where it falls short, where it shines, and why human coaches still matter. Plus: the Flex Diet Certification is open for one week only.

Dr. Emily Dow, PhD, RD, researches where nutrition, resistance training, and gut health actually meet — and where the science gets oversold. We get into what her 12-week vinegar-and-lifting study really showed, why most direct-to-consumer microbiome tests aren't worth your money, and why peptides deserve far more skepticism than hype.

In this episode of the Flex Diet Podcast, I sit down with Dr. Nathan Jenkins to discuss how to improve performance, body composition, and long-term health through the lens of aerobic development and metabolic flexibility. Nathan shares his journey from exercise physiology and coaching CrossFit athletes to his new role teaching physiology at the University of Georgia School of Medicine. We discuss why metabolic flexibility is such a powerful framework for understanding everything from biochemistry and exercise performance to metabolic disease. We also dive into interpreting maximal exercise testing data, including VO₂ measurements, EKG analysis, and near-infrared spectroscopy (NIRS), along with how different energy systems work together during training and competition. Nathan explains why building an aerobic base is critical for repeated high-intensity performance, how pacing impacts outcomes, and why the ability to "suffer" is actually a trainable skill. To wrap up, we cover practical strategies you can apply right away, including prioritizing protein and carbohydrates, improving sleep quality, and addressing common micronutrient deficiencies through blood work, such as magnesium, vitamin D, and omega-3 status.

In this episode of the Flex Diet Podcast, I sit down with my friend Tracy Holemeyer (Uncontrollably Me, host of the Other Way to See It podcast) to talk about healing and performance through nervous system flexibility, somatics, and self-awareness, especially with how much stress people are carrying right now. We dig into practical tools like orienting, grounding, the “starfish” drill, pendulation, and Tracy’s “core four” (soft eyes, relaxing the tongue, breath pacing for coherence, and soft knees), plus how posture and unconscious habits can shape mood and behavior. We also explore the value of community and coaching, how movement and sound (including humming, voo breath, and growling) can help regulate, and we finish with a thoughtful discussion on psychedelics, integration, and why support and discernment matter.

In this episode of the Flex Diet Podcast, I sit down with human performance specialist and coach Rob Wilson for a wide-ranging conversation that spans music, coach education, and what it really means to train for performance longevity. We dig into Rob’s new book, The Check Engine Light: Tune In Your Body and Mind to Achieve Performance Longevity, and his work educating coaches through ALTIS and with special operations communities. Rob also shares why jiu-jitsu strength and conditioning still lacks clear performance standards and proposes building sport-specific frameworks (like lower-body clinching demands) before jumping to exercise selection. We talk grip strength vs endurance, avoiding redundancy and tendon issues, contra-specific training for durability, and why “recovery” isn’t the goal—adaptation is—especially in elite sport.

In this episode of the Flex Diet Podcast, I talk with my good buddy Chad Landers, veteran trainer, strength coach, and author of Building Strength and Muscle After 50, about how to keep gaining strength and muscle as you get older without falling off the “injury cliff.” We dig into why consistency matters most, how progress often drops in steps after injuries, and why smart modifications beat worshipping any single lift. Chad shares lessons from coaching clients for decades, including balancing pressing with back work, using better technique (like pause benching), and building conditioning with tools like the fan bike, rower, and step mill. We also cover practical programming, tracking PRs beyond 1RM, and why it’s never “too late” to start training—especially after 50.