The Emmy nominee revealed that “my body was completely different” because of all the training, which led to her not being able to “fit in any of my clothes.”

While playing Christy Martin in a biopic, Sweeney revealed in June 2025 that she gained over 30 pounds for the role. I loved it,” she told W Magazine at the time. I came onboard to play Christy, and I had about three and a half months of training.

Sydney Sweeney is sharing the 'crazy' 30-pound body transformation she had to play female boxer Christy Martin in a new biopic releasing this year.