Warrior is a story of two brothers both fighting MMA and must eventually face each other in the cage.
One is an ex-marine who comes from military and gets his father to train him and finally gets on the champions road. His brother starts fighting simply because he doesn’t earn enough being a school teacher and he gets in the cage to get some dough to support the family.
There is an intrigue in the movie that the brothers are distant from each other probably due to their father being an alcoholic when they were the kids.
Though it is hard to imagine two brothers fighting in a cage under MMA rules. Would be something similar if we witness Klistchko brothers punching each other in a professional boxing ring.