Requiem for a Heavyweight (1962) takes a pretty good look at that. It has a neat POV segment at the beginning that shows a fight with Cassius Clay through the e

Requiem for a Heavyweight (1962) takes a pretty good look at that. It has a neat POV segment at the beginning that shows a fight with Cassius Clay through the eyes of the main character. https://www.imdb.com/title/tt0056406/ https://www.imdb.com/title/tt0056406/ And well... there's also Rocky V...