Are reasons causes?

When we ask someone "why do you do that?", we are asking for her/his reasons. It someone asks me "why do you play tennis?" and I say "I like to stay fit and I like to have fun. Tennis is good exercise and good fun, therefore I play tennis", I am giving my reasons. (It doesn't matter if having fun actually is a form of suffering. My reasons are still my reasons.) In light of Buddhist philosophy, would it be right to say that my reasons are the *causes* of my behavior? Is there any general agreement across tenet systems? Or is it one answer for Vaibhashika, one for Sautrantika, one for Chittamatra and one for Madhyamika?