"Cowboy Up" is really a celebration of those risk-taking, daredevil personalities of modern rodeo. From the realm of pro bull riding, newcomer Ely Braxton (Marcus Thomas) is the craziest guy around. His brother Hank (Kiefer Sutherland) is a rodeo clown, and the two use each other to play up their own acts. But love might be. When Ely falls for the rodeo's sweetheart (Daryl Hannah), Hank is full of jealousy and hate. The rivalry gets too mad while the bulls in the ring, although the brothers make an effort to come to grips with their gaps.