By this point, anyone remotely interested in incredible boxing movies may have heard about the upcoming Christy Martin biopic starring Sydney Sweeney. For some time now, Sweeney has been making headlines for her role in the sports flick, starting with her impressive 30 pound physical transformation. The A-lister also managed to channel her inner Rocky Balboa while training to play Martin in a very specific way. And, based on how she described the work she put in, this was no joke.
