Sydney Sweeney details how she went through a rigorous training regimen to prepare to play boxer Christy Martin in an upcoming biopic based on her life.

For context, Sydney is starring as Christy Martin — the American fighter known for putting women’s boxing on the map in the mid ‘90s — in a biopic due to release later this year. Speaking to W Magazine for a brand new cover, it was revealed that Sydney gained over 30 pounds to play the part.

Sydney Sweeney underwent a major transformation to portray boxer Christy Martin. The actress gained 30 pounds and went up four jeans sizes, and felt "crazy strong" as a result.