"You train for football." would be "Te entrenas para fútbol." In the formal it is "Usted se entrena para fútbol." The verb is entrenarse.
Tren would be the best way to say "train" in Spanish.
Football in Spanish is fútbol. :)
to train (prepare) = disciplinar, educar to (get/put on a) train = entrenar(se)
The Ghost Train = El Tren Embrujado
futbol
Subirse al tren.
Mirando fútbol.
ruedas del tren
Me gusta fútbol americano
(Yo) quiero futbol
yo juego futbol
Yo practico futbol.