Talented players need physical and mental challenges.

Autor: Naul, Roland, Brüggerman, Detlev, Volz, Christiane, Halemeier, Maik, Altenbeck, Birger, Hoffman, Dirk

Publikováno v: Success in Soccer; Nov2008, Vol. 11 Issue 6, p30-38, 8p, 5 Color Photographs, 3 Diagrams, 5 Graphs