I’m currently reading the book Harry Potter and the Goblet of Fire by the just plain awesome J.K. Rowling.
In this book Harry is entered in an extremely dangerous tournament against his will. He’s pretty much forced to try as hard as he can… or get seriously injured facing the unknown that lies ahead. His motivation during this book is to survive, although sometimes he acts just so that he doesn’t embarrass himself, like when he tries really, really hard to get a date for the Yule Ball. In that part he just wants to make sure that he’s not the only champion that hasn’t got a dance partner.
In my opinion, Harry is pretty much forced to act until the end, when the plot unfolds and his life hangs in the balance as well as many others.