The “Anyone but You” star filmed all of the film’s boxing sequences “back to back to back” over the course of a single week while continuing to train in the off hours. “I’d wrap after a 12-hour shoot and then I’d go train for another two hours. That whole week was grueling.”

For Sydney Sweeney, embodying champion boxer Christy Martin for the film Christy meant a physical transformation, learning how to box and being observed by the real woman she was playing - all things that she ultimately embraced with gusto.