It is Rocky IV except the boxing also includes kicking
Still enjoyable for all the regular JCVD movie reasons. However, having watched this again for the first time in forever, it is very clear that the story is a slightly modified version of Rocky IV.
Dude's friend is a big deal in the US.
Friend fights a foreign competitor in what should be a regular old match.
Friend gets killed/crippled in the fight by a foreign beast of a man.
Dude trains to fight the Beast.
Dude defeats the Beast.
....wait, that's the general plot of Bloodsport too. I need to do some research.