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Human Performance Outliers Podcast with Zach Bitter: Daily Summaries Delivered
by 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.
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The most recent episodes — sign up to get AI-powered summaries of each one.
- 1 weeks ago54 min
Episode 503: Last Soul Ultra Steals The Show | Kim Gottwald
Kim Gottwald is a German ultra runner and content creator who went from law student to backyard-ultra standout by documenting extreme projects in public, including a co-win at Go One More in Texas, and a 449 km Last Soul Ultra victory at home. He co-founded the running brand Rappid, became BPN's first German athlete, and now hosts Germany's Last Soul Ultra. He has big plans for expanding Last Soul Ultra into multiple locations, including the US. Kim: kimgottwald.info | IG: @kim.gottwald | YT: @Kim.gottwald Episode Sponsors: LMNT: drinkLMNT.com/HPO (free sample pack with purchase) deltaG: deltagketones.com Code: BITTER20 (25% Off) Podcast Details: 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
- 1 weeks ago1h 14m
Episode 502: Backyard Ultra Records & Recovery | Phil Gore
Phil Gore holds the World Best mark for the Backyard format, completing 119 "yards" for a total of 495.83miles. He recently completed a personal project, called Project 168, where he aimed to see if he would be able to last 168 yards (700 miles). He ended up tapping out at 152 yards (633.75 miles). We discussed this project, what the limiters were, how they have created a longer recovery, and what direction the Backyard Ultra World is going, and how his event raised nearly $300,000 for Telethon, a Western Australian appeal that supports sick, vulnerable, and disadvantaged kids and their families. You can contribute here: philgore.com.au Phil: philgore.com.au | IG: @phil.gore.ultrarunner Episode Sponsors: LMNT: drinkLMNT.com/HPO (free sample pack with purchase) deltaG: deltagketones.com Code: BITTER20 (20% Off) Podcast Details: 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
- 3 weeks ago1h 19m
Episode 501: First Double Amputee To Finish Leadville 100 Mile Run | Brian Reynolds
Brian Reynolds is a Brooks-sponsored double below-knee amputee runner who, in 2026, became the first athlete in that category to finish the Leadville Trail 100 — on his fourth try, in 28 hours 55 minutes. He lost both legs at age four to meningococcemia, a rare bacterial infection with grim survival odds. For years he hid the amputation and stayed off the trails. A Grand Canyon hike cracked that open. He went from powerlifting to a 2:58 marathon, multiple classification records from 5K to the marathon, and Team USA para-athletics. Brian: IG: @brianreynoldsrunner Episode Sponsors: LMNT: drinkLMNT.com/HPO (free sample pack with purchase) deltaG: deltagketones.com Code: BITTER20 (20% Off) Podcast Details: 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
- 3 weeks ago24 min
Run The News | Phil Gore Shocks Backyard World & Meg Eckert Targets Men's 6-Day American Record
Phil Gore holds the World Best Backyard record with 119 yards (495.87 miles). In an effort to see what he could actually do, he set up a project targeting yards/hours. Meg Eckert may be the most underrated ultramarathon athlete in the game right now. She is currently on pace to break her own women's 6-day World Record, and also the outright American Record. Finally, I touch on some thoughts around the UTMB events. Episode Sponsors: LMNT: drinkLMNT.com/HPO (free sample pack with purchase) deltaG: deltagketones.com Code: BITTER20 (20% Off) Podcast Details: 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 3, 20261h 12m
Episode 500: The Truth Behind Run Slow To Run Fast | Thomas Nobbs
Thomas Nobbs is a professional marathon athlete with a 2:09 PR, and endurance coach. His progression to 2:09 speaks for itself, and his public strava profile shows how he has balanced lots of low intensity running and key quality sessions. Thomas is currently training for the Chicago Marathon, where he plans to once again improve his marathon PR. Thomas: teamrunrun.com/coach/tom-nobbs | IG: @nobbs.not.knobs | Strava: Thomas Nobbs Episode Sponsors: LMNT: drinkLMNT.com/HPO (free sample pack with purchase) deltaG: deltagketones.com Code: BITTER20 (20% Off) Podcast Details: 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
- Aug 28, 20261h 12m
Episode 499: RED-S & Body Composition | Dr. Trent Stellingwerff
Dr. Trent Stellingwerff joined the show to discuss the topic of relative energy deficiency syndrome (RED-S) in endurance athletes, and body competition management. Trent is the Chief Performance Officer (CPO) at the Canadian Sports Institute. Trent has developed many national and international collaborations in various applied research projects in the fields of nutrition and physiology, and been a part of 8 IOC position statements. Trent joined the show to discuss the topic of relative energy deficiency syndrome in endurance athletes, and body competition management in athletics. Trent: csipacific.ca/team-members/trent-stellingwerff | X: @TStellingwerff Sponsors: LMNT: https://drinkLMNT.com/HPO (free sample pack with purchase) deltaG: https://deltagketones.com Code: BITTER20 (20% Off) Support HPO: Website: https://zachbitter.com/hpo Patreon: https://patreon.com/HPOpodcast Coaching: https://zachbitter.com/coaching Zach's Newsletter: https://substack.com/@zachbitter
- Aug 24, 20261h 1m
Run The News | Mark Dowdle Goes Crazy At Last Soul Ultra
Mark Dowdle arrives 15 minutes before the start of Last Soul Ultra, but still wins with nearly 400 miles. Should we have more unsupported ultra running events? Badwater 135 lack of streaming and interesting shoe policy. Jeff Garmire joins me to discuss and share his upcoming documentary. Jeff Garmire: freeoutside.com | IG: @thefreeoutside | YT: @Freeoutside Episode Sponsors: LMNT: drinkLMNT.com/HPO (free sample pack with purchase) deltaG: deltagketones.com Code: BITTER20 (20% Off) Kila Insoles: kilarun.com Code: BITTER ($50 Off) Podcast Details: 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
- Aug 20, 20261h 29m
Episode 498: 2:59 to 2:18 Marathon | Matt Fox - Sweat Elite
Matt Fox joined me to chat about his interest in the marathon after coming from a National class middle distance background, his trajectory with content creation, the Chinese running shoe market, and his power weight ratio journey. Matt Fox: sweatelite.co | IG: @mattinglisfox Episode Sponsors: LMNT: drinkLMNT.com/HPO (free sample pack with purchase) deltaG: deltagketones.com Code: BITTER20 (20% Off) Kila Insoles: kilarun.com Code: BITTER ($50 Off) Episode summary: Zach Bitter interviews Matt Fox (Sweat Elite) Matt's background: Former Australian middle-distance runner who twice finished 5th at Olympic/World trials (consistent 1:48 800m). Felt he "failed" after never making a national team, which later fueled his curiosity about how better runners train. How Sweat Elite started: After a failed Strava-like app, Matt launched a site interviewing pros. He later began filming elite workouts (inspired by old FloTrack videos), but it lost money due to last-minute travel costs and limited YouTube revenue. He recouped losses by documenting his own marathon builds. Content landscape: Athletes now prefer posting their own journeys, making third-party workout videos harder. Influencers-as-coaches is a growing issue; both agree formal qualifications aren't required (many great coaches never had them), but buyers should do due diligence. Bad influencer coaches can still introduce people to the sport who later seek better help. Creators they follow: Truett Haynes (humor + ambitious Olympic Trials goal despite current times being far off; recently hired Rory Linkletter). Also Eric Floberg (cinematography) and Rory Linkletter (authenticity, Canadian marathon record pursuit). Weight/body composition debate: Matt accidentally got very lean (70 kg) for a 2:20 marathon, then gained 3–4 kg and plateaued at 2:23–2:24. After noticing he was much larger than the Japanese runners he raced with, he used carb-cycling (high carbs around key sessions, deficit on easy days) to drop back to ~69 kg and ran 2:18–2:19. He has since lost another ~12 kg. He stresses this is highly individual and risky. Personality matters: people with OCD/obsessive tendencies are more likely to develop RED-S or eating disorders. He now studies nutrition to give safer guidance. Examples cited: Josh Kerr's long-term leaning-out, George Cush dropping weight before winning Comrades, Ryan Hall hitting a point where further loss hurt performance. Both emphasize timing (fuel hard sessions, restrict on recovery days), not living in a perpetual deficit, and resetting after races. Chinese super shoes: Matt recently lab-tested 12 models from Anta, Li-Ning, 361°, Xtep, Dynafish, etc. Many perform comparably to Western shoes at half the price and often last longer. Notable mentions: Li-Ning Dragon Flight (79 g, technically illegal but extremely fast; a legal version is coming), Anta C10 (very similar to Puma Fast-R), Dynafish trainer (versatile, durable, sub-200 g). Barriers in the U.S.: high tariffs, limited specialty-store distribution, and brands currently focused on the Chinese market. Anta and Li-Ning are expanding globally. Matt's current status: Recovering from injury, posting daily on Instagram/Strava as Matt Fox. Targeting a 2:17 or faster at the Melbourne Marathon in two months. Timestamps: 0:00:02 — Intro and welcome to the episode 0:00:45 — Matt shares his background and connection to the podcast 0:01:42 — Matt's unusual running journey and early Sweat Elite work 0:04:33 — Matt's competitive middle-distance background and Olympic trials attempts 0:05:50 — Stepping away from elite running and building Sweat Elite 0:07:19 — From a failed app to interviewing pro runners 0:09:06 — Building content, mo
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About 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.
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