Every punch, every step, even how those punches and steps woulds work to the music that was going to play.
It seems that in order to be sure that the Rocky IV fight scene worked as well as it could, Sylvester Stallone choreographed the entire thing before hand.
Because it’s not a Rocky movie without a solid montage.
Fight scenes can be difficult sequences to film and for something like a boxing movie, where the final fight sequence is the culmination of the entire story, they’re all the more important.