What you'll learn

In the first 4 minutes of the class:

Discover the #1 factor that determines flexibility — well-established in research, but still ignored in practice by almost everyone.

Next
The Proof, Explained Simply

100+ studies broken down in plain language — no dense jargon, just the evidence laid out clearly.

Finally
How to Actually Apply It

The exact methods to train this factor, and the right order to introduce them for the fastest results.

Who's Teaching?

Yiannis Christoulas is an international flexibility coach and exercise scientist. 

Credentials:

• Graduated in Sports Science with the highest grade in the 40-year history of his department.
• Received two awards for academic excellence at Aristotle University.
• Has taught more than 30 seminars on the science of flexibility training across 10 countries.
• Today, he is the only international flexibility coach with published scientific research in the field.

Yiannis entered the world of flexibility with a clear mission: to build a program based on true science that actually works for everyone, no matter their training level.

In this Masterclass, he shares everything he learned on this journey.

We became flexible as adults

For many of us, this journey began as stiff adults with limited time to train — often while juggling other priorities like strength training or a busy schedule. Given that starting point, the margin for error was small, especially when working toward challenging positions like the Side Split, Front Split, or Head-to-Toe.

Looking back, it's clear that none of us succeeded by training harder than everyone else. The results came entirely from our training approach.