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

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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/

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