Sydney Sweeney shared details of her physical transformation for her role as boxer Christy Martin in an upcoming biopic, revealing that she gained over 30 pounds through intense training. The actor underwent weight training, kickboxing, and saw significant changes in her body, including a larger bust and buttocks. Sweeney expressed excitement about her newfound strength and dedication to the role. The untitled sports biopic will depict Martin's rise as a female boxing champion in the 1990s and her harrowing experience surviving a murder attempt by her husband. The film also stars Ben Foster and is produced by several production companies.