Real Madrid legend Iker Casillas goes through his training routine. What's unique about Casillas is of course his size, he's not that tall or big for a goalkeeper but he more than makes up for it with his athletic ability and the way he reads the game.
Casillas also is very good with his feet, both keeping possession of the ball and his distribution out of the back in sending long balls. Casillas is also well known for his short sleeve goalie jerseys - doesn't like those long sleeves, maybe it hinders his ability to stretch his arms to make those saves.
Here are more amazing saves by Casillas, surely the greatest goalkeeper in Real Madrid's history. I'm sure Casillas also looks at a lot of film and knows the players he's playing against, which foot to they favor and how they like to shoot.