

Human Performance Outliers Podcast with Zach Bitter
Zach Bitter
Welcome to the Human Performance Outliers Podcast. Your host Zach Bitter, will take you through a series of interesting topics around health, fitness, endurance, running, hybrid athlete training, ultramarathon, and nutrition. Join in for interviews with folks exploring their outer limits and research in a wide variety of sports, fitness, and nutrition.
Episodes
Mentioned books

Oct 1, 2025 • 51min
Episode 458: Recovery Optimization | Dr. Marc Bubbs
Dr. Marc Bubbs is a Performance Nutritionist, author, speaker and consultant for a portfolio of professional and Olympic athletes and Fortune 100 companies. He is also the co-founder of ProBio Nutrition. In this episode, we dive deep into recovery and what to consider when training. Part one of this series is episode 456 where we cover gut health. Endurance Training Simplified Series ProBio: probionutrition.com Code: Endurance (20% Off) LMNT: drinkLMNT.com/HPO (free sample pack with purchase) deltaG: deltagketones.com Code: BITTER20 (20% Off) Training Peaks: trainingpeaks.com/hpopodcast Support HPO: zachbitter.com/hposponsors HPO Website: zachbitter.com/hpo Zach’s Coaching: zachbitter.com/coaching Zach’s Journal: substack.com/@zachbitter Find Zach: zachbitter.com | IG: @zachbitter | X: @zbitter | FB: Zach Bitter | Strava: Zach Bitter

Sep 25, 2025 • 1h 5min
Episode 457: David Roche | King of the Carbs
David Roche, an elite ultramarathon athlete and coach, shares insights from his recent Leadville 100 performance, where he broke his own record. He discusses innovative high-carbohydrate fueling strategies and how he increased his carb intake over time, improving his performance. David explains the nuances of carb consumption for different events and introduces effective gut training techniques. The conversation also touches on the importance of mindset in competition, encouraging athletes to foster positivity while pursuing their goals.

Sep 19, 2025 • 1h 2min
Episode 456: Gut Health | Dr. Marc Bubbs
Dr. Marc Bubbs, a performance nutritionist and consultant for elite athletes, dives into the world of gut health. He discusses acute gut infections and their impact on performance, along with strategies to prepare for race-day variables. Bubbs emphasizes the importance of training the gut for optimal fueling and reveals the benefits of aerobic conditioning on gut microbial diversity. He also shares tips on automating nutrition and mental strategies to overcome race lows, focusing on key components for gut health like prebiotics and glutamine.

Sep 10, 2025 • 52min
Episode 455: Keira D'Amato | Don't Call It A Comeback
Keira D'Amato, a professional runner and author, discusses her incredible journey from an 8-year hiatus to breaking American marathon records. She shares insights on finding motivation and identity in running, emphasizing resilience through challenges. D'Amato reflects on balancing her real estate career with her athletic ambitions and advocates for the importance of adapting training methods. Humorously, she touches on drug testing as a seasoned athlete, inspiring listeners to embrace aging as a path of continued capability.

Sep 5, 2025 • 1h 28min
Episode 454: Running Shoe Innovation | Todd Falker
Todd Falker, Product Lead at Puma and a lifelong runner with 100 marathons under his belt, shares insights on running shoe innovations. He explores how advanced designs affect performance and comfort, emphasizing the impact of technology on injury prevention. Falker discusses the challenges of balancing fatherhood with a running lifestyle and shares anecdotes about his experiences transitioning to better footwear. The conversation also touches on training strategies for marathons versus ultras, revealing the psychological aspects of age in racing.

12 snips
Sep 2, 2025 • 1h 49min
Episode 453: Cam Hanes | The Growth of Ultra
Cam Hanes, an American bowhunter and endurance athlete, shares his unique insights into the burgeoning world of ultra-running. He discusses the personal connections to nature that fuel this passion and how the sport's evolution welcomes newcomers. Cam touches on the critical role of gear, navigating injuries, and balancing solitude with community support. Furthermore, he examines how controlled events reshape competition perceptions and highlights the importance of mental resilience and innovative training strategies in ultra-endurance sports.

Aug 28, 2025 • 41min
Episode 452: High Carb - My First 8-Weeks
The host shares their journey of switching to a high carbohydrate diet after 14 years of low carb fueling for ultramarathons. They discuss how this dietary change has impacted performance and recovery during training for a 100-mile race. Insights into improved sleep quality and energy levels reveal the surprising benefits of this transition. The episode offers a tantalizing look at the contrasts between the two approaches, making it a thought-provoking listen for anyone interested in endurance training and nutrition.

Aug 14, 2025 • 1h 3min
Episode 451: Running Shoes Will Predict Injury | Royi Metser
Royi Metser, Founder and CEO of Avelo Running, discusses the intersection of technology and running footwear. He shares insights on how smart shoes can predict injuries by analyzing mechanical loading. The conversation delves into the evolution of running gear, emphasizing the importance of wearables like foot pods and heart rate monitors. Metser also explores consumer trends in subscription coaching and the future of personalized running experiences, all while addressing the critical balance between training load and recovery.

Aug 5, 2025 • 1h 34min
Episode 450: Fat Oxidation Levers | Dr. Matthew Cook
Dr. Matthew Cook, a Senior Lecturer in Sport and Exercise Science, dives deep into the fascinating world of fat oxidation, providing key insights for endurance athletes. He discusses how monitoring fat oxidation rates can optimize performance, alongside dietary strategies for training. The importance of tailored fueling strategies for various endurance events is highlighted, along with the roles of caffeine and blackcurrant in enhancing exercise physiology. Cook emphasizes collaboration between research and practical applications, urging a broader engagement with scientific findings.

Jul 29, 2025 • 1h 29min
Episode 449: Nick Bare - BPN Moves into Endurance
Nick Bare is the founder of Bare Performance Nutrition (BPN), and has built a large brand around sharing his journey chasing fitness goals. Recently, Nick and BPN launched a Last Man Standing event called, G1M Ultramarathon on his ranch in Texas. It went viral despite little pre event mainstream ultra media coverage, but rather exploded from participants and BPN creating live and pre/post event content around it. We chat about Nick's current build for an Ironman, the future of BPN Ultramarathon and their move into the endurance world. Nick: nickbare.com | IG: @nickbarefitness | Podcast: Nick Bare Podcast | YouTube: @nickbarefitness | Book: Go One More: Find the Clarity to Make Intentional, Life-Changing Choices Endurance Training Simplified Series LMNT: drinkLMNT.com/HPO (free sample pack with purchase) deltaG: deltagketones.com Code: BITTER20 (20% Off) Maui Nui Venison: mauinuivenison.com/bitter CurraNZ: curranzusa.com Code: Bitter20deal (20% Off) Support HPO: zachbitter.com/hposponsors HPO Website: zachbitter.com/hpo Zach’s Coaching: zachbitter.com/coaching Zach’s Journal: substack.com/@zachbitter Find Zach: zachbitter.com | IG: @zachbitter | X: @zbitter | FB: Zach Bitter | Strava: Zach Bitter