Rock IV was released in 1985 and was written a directed by Sylvester Stallone. It also starred Dolph Lundgren, Burt Young, Talia Shire, Carl Weathers, Tony Burton, Brigitte nielsen and Michael Pataki.
The film earned $300 million.
Apparently the punching scenes filmed between Stallone and Lundgren were completely authentic. One of Lundgren's punches was so hard it forced Stallones heart against his breastbone causing his heart to swell.