How a real-life weightlifting injury forced Rocky Balboa to change his fighting style

Entertainment · Published 3 October 2026 Swipe more like this →

In short: When Sylvester Stallone tore his pectoral muscle while bench-pressing 100 kilograms during training, the script for Rocky II had to change. The injury made it impossible for him to fight right-handed, forcing the iconic southpaw to adapt his character's boxing strategy on the fly for the film's dramatic finale.

Released in 1979, Rocky II serves as the direct sequel to the 1976 original, picking up immediately after Rocky Balboa’s grueling split-decision loss to world heavyweight champion Apollo Creed. While the first film centered on the underdog’s rise, the sequel explores the struggle of sudden fame, financial instability, and the physical toll of a career in the ring. The narrative follows Apollo’s obsession with securing a rematch to silence critics who claimed his initial victory was a fluke, eventually goading a reluctant, semi-retired Rocky back into the sport.

The film’s production was defined by Sylvester Stallone’s determination to direct, a role he secured after lobbying United Artists executives who were initially hesitant due to his previous directorial efforts. During the shoot in Philadelphia, Stallone sustained a severe tear to his right pectoralis major muscle while training with bodybuilder Franco Columbu. This injury necessitated a partially successful surgery and fundamentally altered the film’s climax. Originally, the script did not feature Rocky switching to a right-handed stance; the change was a practical necessity to accommodate Stallone’s inability to fight with his right hand.

Critical reception was mixed but generally favorable, with many reviewers praising the film's characterization and its high-stakes, pugilistic finale. While some critics, such as Janet Maslin, felt the film lacked the freshness of the original, others like Gene Siskel noted that the sequel remarkably managed to recapture the spirit of its predecessor. Despite industry expectations that sequels would only capture 30% to 40% of the original's business, Rocky II proved to be a massive financial success, grossing over $200 million worldwide and cementing its place as the second highest-grossing film of 1979 globally.

Beyond the box office, the film left a lasting cultural footprint, from the iconic scene featuring 800 school children during Rocky’s run to the enduring popularity of Bill Conti’s score. The film’s success paved the way for a long-running franchise, with Rocky III following in 1982. Today, the legacy of the film persists in various forms, including the Rocky 50k, an ultrarunning course that maps the locations of Rocky’s famous Philadelphia training run.

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