Sydney Sweeney revealed she bulked up for her role in the upcoming biopic on the life of boxer Christy Martin.

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.

Sydney Sweeney is opening up about her dramatic transformation to portray legendary boxer Christy Martin in an upcoming biopic. In a new interview with W Magazine published Monday, the actress revealed she spent months training for the role, gaining 30 pounds and going up four pant sizes in the process.