Sydney Sweeney Embodies Boxing Legend In New BTS Photos From Christy Martin Biopic Set

Sydney Sweeney is stepping into the ring—and the role of a lifetime—as new behind-the-scenes photos from the set of the Christy Martin biopic reveal.

Known for her roles in "Euphoria" and "The White Lotus," Sweeney is embracing a new, athletic transformation to portray the legendary boxer, showcasing her commitment to character with a physical transformation that has left her nearly unrecognizable.

Sydney Sweeney’s dedication to the role goes beyond just training; she’s dyed her hair a deep, rich brown, styled with loose curls—a complete departure from her signature blonde, straight look.

In BTS photos obtained by TMZ, pink seems to be the theme of the scene.

Sweeney sports a pink sleeveless Christy Martin shirt, which puts her toned arm muscles on full display, paired with matching pink boxing shoes. Adding to the bold aesthetic, a pink sports car can be spotted parked in the background.

Earlier this month, Sweeney shared snapshots highlighting her new look and muscular build on Instagram, a result of the intense workout regimen she’s undertaken to fully embody Martin’s powerful presence.

"Well, the cats out of the bag thanks to some paps in bushes, so here’s a little bts from my film I'm working on right now," she wrote in the caption at the time.

In an interview with Deadline, Sweeney shared her excitement for the upcoming role, revealing that she has nearly a decade of experience in grappling and kickboxing. She expressed her eagerness to step back into the ring and undergo rigorous training to prepare for the challenging role of Martin.

"Over the past few months, I’ve been immersed in training to bring to life the story of an incredible woman—a true champion who fought battles both inside and outside the ring."

"Her journey is a testament to resilience, strength, and hope, and I’m honored to step into her shoes to share her powerful story with you all. more to come soon," the actress added.

In her post from October 16, Sweeney is pictured in gray sweatpants and a red tank top, flexing her toned arms for the camera and highlighting her impressive physique as she steps into the role of Martin.

Helmed by acclaimed filmmaker David Michôd—renowned for intense dramas like "Animal Kingdom" and "The King"—the currently untitled project will delve into the true story of Martin’s ascent to fame as the most recognized female boxer in 1990s America.

Producers have dubbed Martin the “female Rocky,” highlighting her resilience and impact on the sport.

Sweeney is no stranger to the rigorous training required for a role like this, bringing her background in grappling and kickboxing to her portrayal of Martin.

“I grappled and did kickboxing from 12-19 years old. I’ve been itching to get back into the ring, train, and transform my body," she told Deadline. "Christy’s story isn’t a light one, it’s physically and emotionally demanding, there’s a lot of weight to carry. But I love challenging myself. Christy Martin not only legitimized female boxing, she overcame gender stereotypes, and fought through emotional, physical, and financial abuse."

The actress added, "I’m passionate about the fighting world, Christy’s story shines a light on her incredible rise to the top while showing the struggles of fame behind the curtains. I feel compelled to tell a story about a woman who faced so much adversity and didn’t allow it to defeat her. It’s powerful, and emotional.”

A naturally gifted fighter, Martin’s life changed dramatically in 1989 when she met her manager—and eventual husband—Jim Martin. Breaking barriers in a male-dominated sport, she became the first woman to sign with legendary promoter Don King and made history as the only female boxer to appear on the cover of Sports Illustrated.

Her charisma, striking looks, and fierce resilience in the ring won her a dedicated fanbase and propelled her to the title of welterweight champion. Yet beneath her polished public image lay a story marked by personal struggles, toxic relationships, and a terrifying attempt on her life.

The upcoming movie will star Sydney Sweeney alongside Ben Foster, Merritt Wever, Jess Gabor, Katy O’Brian, Ethan Embry, and Chad L. Coleman.