Sydney Sweeney has shared new photos of herself playing boxer Christy Martin in an upcoming biopic, where she wears a ’90s mullet and added some muscle to play the former athlete.

“Well the cat’s out of the bag thanks to some paps in the bushes so here’s a little BTS from my movie I’m working on right now,” Sweeney wrote on Instagram.

She will star as Martin in an untitled sports biopic directed by David Michod, which recently began production. Martin is a former professional boxer who competed from 1989 to 2012 and was world champion in the super welterweight division in 2009. In 2010, she also survived an assassination attempt by her husband, James Martin. He stabbed Christy multiple times and shot her in their Florida home, but she survived. In 2012, James was convicted of attempted manslaughter and sentenced to 25 years in prison.

“Over the past few months, I have immersed myself in training to bring to life the story of an incredible woman – a true champion who fought battles both inside and outside the ring,” Sweeney wrote. “Her journey is a testament to resilience, strength and hope, and I am honored to walk in her shoes and share her powerful story with all of you. more soon 🙂 CHRISTY MARTIN.”

In 2020, Martin was elected to the International Boxing Hall of Fame in the organization’s first vote that included women.

The cast of the upcoming biopic includes Ben Foster as James Martin, Merritt Weaver, Katy O’Brien, Ethan Embry, Jess Gabor, Chad L. Coleman and Tony Cavalero. The film is produced by Anonymous Content, Black Bear Pictures, Fifty-Fifty Films, Votiv and Yoki Inc.