The filming of Rocky 4 proved almost as dangerous as a real boxing match for its star, Sylvester Stallone.
To make the fourth part of the Rocky saga as realistic as possible, the actors had to get their hands dirty. This was the case with superstar Sylvester Stallone, who endangered his physical health during filming.
The Swedish actor Dolph Lundgren played the role of the terrible Soviet Ivan Drago, who faced Stallone's character, Rocky, in the final fight. For the sake of realism, Stallone asked his Swedish counterpart to do the fight for real.
At that time, Lundgren was a mass of muscles, a real wardrobe. For him, taking Stallone's punches was not a problem, it was for Sylvester that it proved difficult. The American actor was then forced to go to hospital the same evening and stay there for 5 days.
"He struck me so hard in the chest that my heart slammed against my breastbone and began to swell, so the beating became labored, and without medical attention the heart would’ve continued to swell until it stopped. Many people that have car accidents die like this when the steering wheel slams into their chest," Stallone recounted.
Carl Weathers, who played Apollo, also threatened to resign if Lundgren continued to punch for real. This just goes to show - boxing is really not a game!