
Human Performance Outliers Podcast with 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.
Latest episodes

Mar 27, 2025 • 1h 36min
Episode 433: Ultramarathon Record Keeping - Trishul Cherns & Bob Hearn
Trishul and Bob are the President and Record Keeper for the Global Organization of Multi-day Ultrarunners (GOMU). GOMU was established to supplement the existing government bodies that only recognize records of certain ultramarathon events. Both Trishul and Bob have rich histories in ultramarathon, with 100s of official events to their names. We dive into their experiences as well as the growing needs when it comes to rules and record keeping that are specific to the needs of ultrarunning. A few topics we focused on include: pacing in ultramarathon, course certification, shoe tech, and certifying record performances. Endurance Training Simplified Series Zach’s Low Carb Endurance Approach Series LMNT: drinkLMNT.com/HPO (free sample pack with purchase) deltaG: deltagketones.com Code: BITTER20 Maui Nui Venison: mauinuivenison.com/bitter Support HPO: zachbitter.com/hposponsors HPO Website: zachbitter.com/hpo Amazon Store: amazon.com/shop/zachbitter Zach’s Coaching: zachbitter.com/coaching Zach’s Newsletter: substack.com/@zachbitter Find Zach: zachbitter.com - IG: @zachbitter - X/Tw: @zbitter - FB: @zbitterendurance - Strava: Zach Bitter GOMU: gomu.org - IG: @gomu_org - FB: GLOBAL ORGANIZATION OF MULTI-DAY ULTRAMARATHONERS (GOMU)

Mar 21, 2025 • 34min
Episode 432: Hybrid Workouts & Hills - Training Recap
For this training recap, I unpack a four week block of training where my main focus was a continuation of speed work development with a bit more variety of inputs this time around. Hybrid workouts, fast finishes, and hills all included. I highlight the thought process behind the programming, execution, and add some tips to consider in training as I build up for a 100 mile track ultra in June! Endurance Training Simplified Series Zach’s Low Carb Endurance Approach Series LMNT: drinkLMNT.com/HPO (free sample pack with purchase) deltaG: deltagketones.com Code: BITTER20 Maui Nui Venison: mauinuivenison.com/bitter Support HPO: zachbitter.com/hposponsors HPO Website: zachbitter.com/hpo Amazon Store: amazon.com/shop/zachbitter Zach’s Coaching: zachbitter.com/coaching Zach’s Newsletter: substack.com/@zachbitter Find Zach: zachbitter.com - IG: @zachbitter - X/Tw: @zbitter - FB: @zbitterendurance - Strava: Zach Bitter

Mar 7, 2025 • 1h 34min
Episode 431: Ultra Run Across Texas with Matt Johnson
Matt Johnson got into running in 2020 after discovering a love for the sport following a difficult youth, and a career in the National Guard. Since, he has built a successful Instagram channel that blends competitiveness and humor. He took his love of running across the State of Texas, an 841 mile journey in 17 days, raising awareness for ValorFit. Endurance Training Simplified Series Zach’s Low Carb Endurance Approach Series LMNT: drinkLMNT.com/HPO (free sample pack with purchase) deltaG: deltagketones.com Code: BITTER20 Maui Nui Venison: mauinuivenison.com Support HPO: zachbitter.com/hposponsors HPO Website: zachbitter.com/hpo Amazon Store: amazon.com/shop/zachbitter Zach’s Coaching: zachbitter.com/coaching Zach’s Newsletter: substack.com/@zachbitter Find Zach: zachbitter.com - IG: @zachbitter - X/Tw: @zbitter - FB: @zbitterendurance - Strava: Zach Bitter Matt: IG @mattjohnson - YouTube: @mattjohnson__

Mar 4, 2025 • 1h 38min
Episode 430: Running Shoes with Brady Holmer
For this episode, Brady and I dive into a group of running shoes that we have been putting through the paces the last couple of months, as well as touched on some models that we have worn historically. We also share some thoughts around running shoe considerations in general. Shoes covered include: Mizuno Neo Zen and Wave Rebellion Pro 3, Puma Deviate Nitro Elite 3, Mount to Coast R1 S1 and P1, Xero HFS II, Nike Zoom Fly 6, and Altra Vanish Carbon II. Endurance Training Simplified Series Zach’s Low Carb Endurance Approach Series LMNT: drinkLMNT.com/HPO (free sample pack with purchase) deltaG: deltagketones.com Code: BITTER20 Maui Nui Venison: mauinuivenison.com Support HPO: zachbitter.com/hposponsors HPO Website: zachbitter.com/hpo Amazon Store: amazon.com/shop/zachbitter Zach’s Coaching: zachbitter.com/coaching Zach’s Newsletter: substack.com/@zachbitter Find Zach: zachbitter.com - IG: @zachbitter - X/Tw: @zbitter - FB: @zbitterendurance - Strava: Zach Bitter Brady: https://www.physiologicallyspeaking.com/ - X: @B_Holmer - IG: @brady.j.holmer - Strava

4 snips
Feb 28, 2025 • 33min
Episode 429: Blisters & Your Best Workout - Listener Q&A
How should you go about managing and preventing blisters, and what workout is going to be best for you. This listener Q&A dives into these two topics. Endurance Training Simplified Series Zach’s Low Carb Endurance Approach Series LMNT: drinkLMNT.com/HPO (free sample pack with purchase) deltaG: deltagketones.com Code: BITTER20 Maui Nui Venison: mauinuivenison.com Support HPO: zachbitter.com/hposponsors HPO Website: zachbitter.com/hpo Amazon Store: amazon.com/shop/zachbitter Zach’s Coaching: zachbitter.com/coaching Zach’s Newsletter: substack.com/@zachbitter Find Zach: zachbitter.com - IG: @zachbitter - X/Tw: @zbitter - FB: @zbitterendurance - Strava: Zach Bitter

Feb 21, 2025 • 26min
Episode 428: Intervals & Long Runs - Training Recap
In a recent training recap, the focus was on mastering short intervals and long runs. The speaker shares insights from a detailed training plan aimed at a 100-mile race. There's a discussion on balancing intensity with recovery while tracking progress. Additionally, the importance of nutrition in endurance training is highlighted, along with exclusive discount codes for products that enhance performance. This mix of personal experience and practical tips shapes a thoughtful approach to ultra-endurance training.

Feb 19, 2025 • 1h 14min
Episode 427: Ryan Dreyer - Community Based Training
Ryan Dreyer founded Tribal Training, a group based endurance training coaching service where members leverage a community approach to reach their goals. Ryan has completed both Ironman and ultramarathon distance events and coached many others reach their goals. Endurance Training Simplified Series Zach’s Low Carb Endurance Approach Series LMNT: drinkLMNT.com/HPO (free sample pack with purchase) deltaG: deltagketones.com Code: BITTER20 Maui Nui Venison: mauinuivenison.com Support HPO: zachbitter.com/hposponsors HPO Website: zachbitter.com/hpo Amazon Store: amazon.com/shop/zachbitter Zach’s Coaching: zachbitter.com/coaching Zach’s Newsletter: substack.com/@zachbitter Find Zach: zachbitter.com - IG: @zachbitter - X/Tw: @zbitter - FB: @zbitterendurance - Strava: Zach Bitter Ryan: traintribal.com - IG: @theryandreyer - X: @theryandreyer

Feb 12, 2025 • 1h 7min
Episode 426: Steve Magness - Win the Inside Game
Steve Magness is a world-renowned expert on performance. He is the author of the new book, Win the Inside Game, and has also authored, Do Hard Things: Why We Get Resilience Wrong and The Surprising Science of Real Toughness. He is the coauthor of Peak Performance. The Passion Paradox, and the author of The Science of Running. For this episode we dive into the topics covered in his latest book. Endurance Training Simplified Series Zach’s Low Carb Endurance Approach Series LMNT: drinkLMNT.com/HPO (free sample pack with purchase) deltaG: deltagketones.com Code: BITTER20 Maui Nui Venison: mauinuivenison.com Support HPO: zachbitter.com/hposponsors HPO Website: zachbitter.com/hpo Amazon Store: amazon.com/shop/zachbitter Zach’s Coaching: zachbitter.com/coaching Zach’s Newsletter: substack.com/@zachbitter Find Zach: zachbitter.com - IG: @zachbitter - X/Tw: @zbitter - FB: @zbitterendurance - Strava: Zach Bitter Steve: stevemagness.com IG: @stevemagness Tw: @stevemagness FB: facebook.com/stephenmagness

Feb 7, 2025 • 1h 42min
Episode 425: The Hunt for the Best Super Shoe with Dustin Joubert
Dustin Joubert, a PhD in Exercise Physiology and running researcher at St. Edwards University, dives deep into super shoe technology and running efficiency. He discusses the unbiased advantages of independent research and how super shoes have revolutionized running, shifting from minimalist to maximalist footwear. The conversation highlights how shoe choice impacts performance differently at various paces, emphasizing comfort and testing. Joubert also reflects on the rapid advancements in shoe tech and the ongoing evolution of athletic footwear.

Jan 28, 2025 • 16min
Episode 424: Training Recap - Early 2025
This is part one of a series this year where I reflect on my training blocks for 2025. This episode covers the first three weeks after switching from an offseason/strength focus towards running taking the primary position. Endurance Training Simplified Series Zach’s Low Carb Endurance Approach Series LMNT: drinkLMNT.com/HPO (free sample pack with purchase) deltaG: deltagketones.com - IG: @deltag.ketones Code: BITTER20 Support HPO: zachbitter.com/hposponsors HPO Website: zachbitter.com/hpo Amazon Store: amazon.com/shop/zachbitter Zach’s Coaching: zachbitter.com/coaching Zach’s Newsletter: substack.com/@zachbitter Find Zach: zachbitter.com - IG: @zachbitter - X/Tw: @zbitter - FB: @zbitterendurance - Strava: Zach Bitter