If you’ve been around endurance sport long enough, you start to notice something…

The biggest breakthroughs rarely come from something new.

They come from finally understanding and applying those simple, persistent, enduring, principles.

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In this episode of MAD Science Meets Real Life, we sit down with Joel Filliol—one of the most experienced and respected coaches in the sport - coach of the 2000 Olympic Champ - Simon Whitfield…

Simon Whitfield storms home to take gold at the Sydney Olympics - David Ashdown | Alamy

,,,,along with 3 Olympic medals, 6 World Championships, 30 WTS wins and 100 WTS podiums over the last 30 years of coaching.

But what makes Joel interesting isn’t just the consistent results.

It’s the consistency of his message.

Over decades in the sport, while trends have come and gone—threshold this, polarized that, now Zone 2 everything—his core philosophy has steadily converged toward something surprisingly simple:

Build that low-intensity base
Progressively. Over time.
And most importantly… don’t rush the process.

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We spend a lot of this conversation unpacking where things actually go wrong for athletes.

Not in theory—but in practice.

Why intensity is still the biggest trap.
Why “easy” training is quietly getting too hard.
Why many promising athletes plateau (or disappear) despite doing all the “right” things.

And perhaps most interestingly…

Why so much of good coaching is built not on success - but on mistakes…

The sessions that went a little too far.
The moments where instinct said “pull back”… and we didn’t.
The hard lessons that shape how we think about training years later.

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There’s also a broader theme running through this one that I think a lot of you will resonate with:

We’re living in an era of infinite information.

Every athlete now has access to everything—methods, metrics, marginal gains, the latest “secrets” from the top of the sport.

And yet…

Performance still comes back to the same fundamentals:

Consistency.
Patience.
And getting the basics right—over and over again.

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If you’ve ever found yourself wondering:

Am I doing too much intensity?
Am I actually going easy enough on my easy days?
Am I chasing the wrong things?

…this one will hit close to home.

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As always, this is a conversation that sits right at the intersection of MAD Science and Real Life—where physiology meets practice, and where the messy reality of coaching shapes what actually works.

Enjoy.

And, for a deeper dive, please check out Joel’s excellent Substack -

And this stellar in-depth Q & A with Joel and Inaki…

Iñaki’s de la Parra Substack

What 30 Years of Coaching Taught Joel Filliol

Join 4,000+ athletes, coaches, and everyday winners reading my Substack, where I consistently share conversations like this, along with insights on performance, mindset, and systems for sport, family and life…

7 months ago · 59 likes · 18 comments · Iñaki de la Parra and Joel Filliol

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