We are at Real Madrid Ciudad Deportiva, the famous training ground where world-class football legends like Zinedine Zidane, Luis Figo and Cristiano Ronaldo shaped their incredible skills. Where good is never good enough. 22 players grace the field today, Cristiano Ronaldo is there. He’s still the new kid for now.

For everyone there, except one, this is just another training session. The exception is Dutch journalist, writer and performance researcher Eric Castien. He feels like he just solved a very complex puzzle. Looking at the players in motion on the pitch, Castien feels he has an answer to the question: