In this episode of the Rox Lyfe podcast, we chat with Thierry Willigenburg - Elite 15 doubles athlete, endurance specialist, and co-founder of Train.Red.

Alongside Hidde Weersma, Thierry has qualified for the 2026 HYROX World Championships in Stockholm and the pair have already clocked a huge PB of 48:53 in Elite 15 doubles competition.

In this conversation, we go deep into:

Thierry’s sporting background
How doubles racing has evolved at the elite level
The training sessions that helped them achieve the fastest run splits in Warsaw
How he's improved his wall balls
How Thierry uses drop sets and muscular endurance work for HYROX
The differences between singles and doubles preparation
What he’s learned training alongside Hidde Weersma
The role recovery, nutrition and consistency play in elite performance
How muscle oxygen sensors work and what they reveal about HYROX pacing
Why local muscular fatigue can matter more than heart rate during stations like sled push and lunges

Thierry also explains the work he’s doing with Train.Red and how muscle oxygen data could change the way HYROX athletes approach training, pacing and race strategy moving forward.

It was a really insightful conversation with a very thoughtful athlete, and I think you’ll really enjoy it.

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