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.

I was so strong, like crazy strong,' Sweeney told 'W Magazine'NEED TO KNOWSydney Sweeney underwent a major transformation to portray boxer Christy MartinThe actress gained 30 pounds and went up four jeans sizes,

David Michôd said he was shocked to speak with Sweeney via FaceTime in the more recent past, saying she was in the makeup truck for Euphoria and was "stunned" that she'd gone from her Martin look to something "so glamorous" for the HBO series.