WSER 100 is becoming one of the most recognized and high stakes 100 mile ultramarathons for both professionals and ultramarathon participants. we can learn a lot about how participants are preparing and completing this event. Here are some things to consider from what we learned at the 2025 WSER 100.

• Heat adaptation and in race management

• The power of race day expectations

• The psychology around group and competitive pressure

• Considerations around varied weather events

• The role of super shoes on the trails

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 Newsletter: substack.com/@zachbitter

Find Zach: zachbitter.com - IG: @zachbitter - X/Tw: @zbitter - FB: @zbitterendurance - Strava: Zach Bitter

Jeff Garmire is a professional ultramarathon athlete, coach, author, podcast host, and one of a very few to have participated in all Cocodona 250 events. Long ultras are not even long for Jeff, as he has also completed some monster through hikes like John Muir Trail, Arizona Trail, Continental Divide and more. He is currently gearing up for an unsupported attempt on the Appalachian Trail in August.

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 (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 Newsletter: substack.com/@zachbitter

Find Zach: zachbitter.com - IG: @zachbitter - X/Tw: @zbitter - FB: @zbitterendurance - Strava: Zach Bitter

Jeff: freeoutside.com | IG: @thefreeoutside | YouTube: @JeffGarmire | Podcast: Free Outside Podcast

Meghan Canfield has a deep history and love for the WSER 100 Endurance Run, completing it 13 times and finishing in the top 10 on 10 occasions. She has been a long time friend, and big influence on the ultramarathon community. She joined me to discuss why the WSER 100 is unique, her many experiences with this event, as well as growing with the sport.

Meghan: zenithcoaches.com/about-us/meghan-canfield - IG: @runningmegleg

Endurance Training Simplified Series

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 Newsletter: substack.com/@zachbitter

Find Zach: zachbitter.com - IG: @zachbitter - X/Tw: @zbitter - FB: @zbitterendurance - Strava: Zach Bitter