Only the Strong(1993)

Luis Stevens returns from a four-year stint as a Green Beret in Brazil to find that his old high school in Miami has turned into a breeding zone for violence and drugs. Determined to do all in his power to turn Lincoln High -- and its students -- around, Luis proposes a program to the principal and key members of the faculty give him the twelve worst students in the school, and, through a specialized kick boxing program that will harness their naturally destructive energies, he'll make them into decent human beings, and create a blueprint by which the entire school, and perhaps the city itself, can be changed for the better. Of course, the leader of the local gangs, a vicious man called Slverio,isn't pleased about this at all.