Ok, here is what I remember of the movie. In the movie, it is futuristic. A human is a fighter in a world that has various creatures that fight as well. He has to fight various ones and at the end has to fight this one that looks half man half bull. I am not really sure what the name of the movie is, but would love to know.

The movie you are looking for is Arena from 1989, starring Paul Satterfield, currently appearing on the soap opera One Life to Live, Claudia Christian of Babylon 5 fame, and Marc Alaimo and Armin Shimerman from Deep Space Nine. It was written by Danny Bilson, father of actress Rachel Bilson.