Engineering a UTMB Win

Update: 2025-09-19

Description

We start this week off with some NYC Marathon news before diving into some recent doping happenings. After this we review the Ironman World Championships in Nice before a look at the World Track and Field Championships. Finally we have our interview with Joseph Mestrallet.

Joseph Mestrallet is a data scientist ,CEO and Founder of Enduraw. Additionally he is currently the team manager at Nutri-pure, where he works with multiple elite athletes with a deep conviction: mathematics are the keys to reach the last few percent of performance. Joseph is the data scientist who helped engineer wins at UTMB for Tom Evans and Ruth Croft.

(00:00 ) Introduction

(00:25 ) Medical Question

(03:40 ) David’s Update and Time in Nice

(08:00 ) Community Shoutouts

(12:53 ) NYC Marathon Announces Sifan Hassan and Eliud Kipchoge

(16:33 ) Joyline Chegnego Positive Test

(19:15 ) Raven Saunders Whereabouts Failures

(20:40 ) Diribe Welteji Test Refusal and Ban Upheld by CAS

(21:58 ) Sebastian Sawe Extra Testing Pre Berlin

(23:49 ) Ironman World Championships Nice

(29:05 ) Track & Field World Championships

(30:15 ) Predictions Update

(32:34 ) Falls in the Races

(32:24 ) False Starts and the Starter

(35:24 ) Discuss Body Types

(37:38 ) Field Event GOATs

(39:23 ) Why is the USA so Successful

(41:21 ) World Championships Broadcast

(42:18 ) Narrow Margins of Victory

(43:28 ) Observations from the Marathons

(49:09 ) Other Observations from the World Championships

(52:30 ) Interview Starts

(55:55 ) What Other Projects has Joseph Worked on?

(59:24 ) What Data Does Joseph Collect for his Planning?

(1:01:32 ) What Goes Into Wholistic Performance?

(1:08:09 ) How Close was Joseph’s Pacing Plan to Actual Performance?

(1:10:29 ) What Sort of Testing did Joseph do to Prepare the Pacing Plans?

(1:14:00 ) Predictions Margins of Error

(1:16:17 ) What Live Data was Joseph Giving During the Race?

(1:19:27 ) Is This Data Informed Preparation Against the Spirit of Trailrunning?

(1:20:17 ) What Live Data was Joseph Giving During the Race?

(1:23:24 ) How is Joseph Thinking about AI in his Work?

(1:30:00 ) Doctors Office

(1:31:06 ) What We’re Watching

Thanks to Precision Fuel and Hydration for their sponsorship, use the link below to get 15% off your first order and support the podcast:

https://visit.pfandh.com/theonepercentbetterpodcast

If you’re unsure how which products to use or how to plan your race nutrition check out Precision’s Fuel & Hydration Planner (if you follow this you will have your discount applied automatically on your first order too):

https://visit.pfandh.com/onepercentfuelplanner

Thanks also to Stryd for their sponsorship, check out Stryd:

Stryd helps you optimize your training and racing by measuring your running power, providing real-time data to improve efficiency, pace, and performance on any terrain. Plus, it integrates seamlessly with your favorite running watch for real time guidance! Go to https://stryd.live/opb to export Stryd’s cutting-edge technology and how it can empower your run.

Article on Joyline Chepnego Ban

https://iancorless.org/2025/09/12/joyline-chepngenos-ban-the-complex-web-of-doping-management-and-responsibility/

Links to Joseph

Enduraw Website: https://enduraw-data.com/

Enduraw Strava Integration: https://enduraw-data.com/services/enduraw-dashboard

Enduraw Instagram: https://www.instagram.com/enduraw.data/

Joseph's Website: https://joseph-mestrallet.com/

Joseph's Instagram: https://www.instagram.com/josephmestrallet/

Submit topics, feedback or questions to us on Instagram via DM or to the email address: podcast.1percentbetter@gmail.com

Follow us on Instagram:

https://www.instagram.com/onepercentbetterpod?igsh=MW1tcGM4MHQ4bm5oaw==

Follow us on X: