Sylvester Stallone's near-death experience on the set of "Rocky IV" is recounted in a new documentary.
Stallone was punched so hard in the chest during a boxing match scene that his heart started to swell.
He was rushed to the hospital and spent nine days in intensive care.
Stallone reflects on the experience, admitting that he pushes himself too hard, resulting in multiple back operations.
He also discusses another injury he sustained while filming "The Expendables," where he broke his neck during a fight scene.
Stallone underwent surgery and now has a permanent metal plate in his neck.
He admits that these injuries have taken a toll on his body and he has never fully recovered.
Stallone questions whether it was worth it to put his body through such risks for the sake of his career and people's approval.
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