Spain have won every major tournament going since 2008, and their youngsters are the best in Europe, given they won the European U-21 Championships this summer.
With that in mind, you might expect training to be hard.
As the video above shows, though, it actually looks like a lot of fun.
In a very school playground-style setup, the 18 outfield players are pitted against the three goalkeepers and try to score.
Eventually, Real Madrid youngster Alvaro Morata does get a goal past the stoppers—but not before we see a host of technically excellent attacking play and some outstanding goalkeeping.