Sydney Sweeney trained for months and gained 30 pounds to prepare for Christy Martin biopic

EntertainmentSports
9 Sep 2025 • 6:42 AM MYT
The Independent
The Independent

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  • Sydney Sweeney stars as International Boxing Hall of Famer Christy Martin in a new biopic, which premiered at the Toronto International Film Festival (TIFF) this weekend.
  • For the role, Sweeney underwent a significant physical transformation, gaining 30 pounds and training in boxing for several hours a day over three months.
  • She expressed her enjoyment of the rigorous training, stating she 'truly felt Christy’s power' as she transformed.
  • Sweeney initially felt nervous about Martin being on set, but grew to love her presence, finding her energy and spirit enjoyable for the entire crew.
  • To achieve realism in the fight scenes, Sweeney revealed that she and her co-stars actually punched each other, sometimes resulting in bruises and concussions.

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