Quality quote:
"The other day I was surprised. I saw an old photo and I said to my wife..." His voice trails off as he flicks backwards and forwards through the relevant chapter. "Is the photo here? Yes, this one."
It's a shot of Real Madrid's Under-18 side from season 1986/87. He traces his finger from left to right across the players in the back row then their crouching team-mates at the front, and starts to recite. "I said to her: 1.82, 1.84, 1.82, 1.79, 1.87, 1.76, 1.88, 1.84, 1.86, 1.79, 1.68, 1.72, 1.74, 1.69, 1.78, 1.73, 1.68."
These are the individual heights, in metres, of a group of teenagers that he coached almost 20 years ago."