Sydney Sweeney transforms into a boxer for Christy Martin biopic

Sydney Sweeney takes on the role in a new look as she prepares for the role of the boxer Christy Martin in an upcoming biopic.

“Well the cats are out of the bag thanks to some crumbs in the bushes so here are some BTS from my movie I'm working on,” Sweeney, 27, wrote via Instagram on Wednesday, October 16 with some first look photos of her on set. “Over the past few months, I have been training intensively to bring to life the story of an incredible woman – a true champion who fought battles both in and out of the ring.”

In the pictures, Sweeney showed off how she swapped her iconic blonde locks for a curly brunette hairstyle with bangs. The actress wore gray sweatpants, a red cut-off T-shirt and white sneakers.

Sweeney also proved that her training was worth it. In one fell swoop, she flexed her super-toned arm muscles and smiled brightly as she celebrated her new slim body.

Related: Sydney Sweeney stuns in Structural Balmain top at Immaculate premiere.

Sydney Sweeney is no stranger to the red carpet. The actress has racked up too many acting roles to count over the years (50+!) – so it's safe to say she knows how to rock the step-and-repeat. While Euphoria – and its epic character Cassie Howard – may come to mind when you think of the Washingtonians (…).

“Her journey is a testament to resilience, strength and hope, and I am honored to follow in her footsteps and share her powerful story with all of you,” the actress continued. “More coming soon :).”

The project was first announced in May and Sweeney raved about how excited she was to get started.

“I fought and did kickboxing from the age of 12 to 19. “I’m itching to get back in the ring, train and change my body,” Sweeney said in an interview with deadline at the time. “Christy's story is not an easy story, it is physically and emotionally demanding, there is a lot of weight to carry. But I love challenging myself.”

Although the film doesn't have a title yet, it will be directed by the director David Michod. The cast also includes Sweeney Ben Foster, Merritt Wever, Ethan Embry And Katy O'Brian.

The film will follow the life of Martin, now 56, and her journey to becoming one of America's most successful boxers. Martin began her career in 1989 after meeting her manager and later husband James Martin. In 2009, she won the World Boxing women's super welterweight title. She continued boxing until 2012.

In 2010, Christy almost died after being attacked by James. He was arrested and charged with attempted first-degree murder and aggravated assault with a deadly weapon. Two years later, James was found guilty of attempted second-degree murder. He is currently serving a 25-year prison sentence.

Christy was the first female boxer elected to the Nevada Boxing Hall of Fame in 2016. She was also elected to the International Boxing Hall of Fame in 2020, the first year women were on the ballot.