Sydney Sweeney Gets Real About Dramatic Physical Growth She Experienced While Filming Upcoming Biopic

Sydney Sweeney has never fit the Hollywood mold, and she does not plan to start now. One moment, she lights up the screen with romantic comedy charm, and the next, she trades sweet smiles for knockout punches. She has lived a thousand actor dreams—box office surprises, music video stardom, even vintage car restoration. But her next challenge demands grit, sweat, and transformation. In her upcoming biopic, Sweeney pushed past limits, embracing a powerful physical evolution that proves she is not just playing tough—she is tough.
Sydney Sweeney peeled back the curtain on the intense physical transformation she underwent to step into the ring—literally—for her upcoming biopic.
Sydney Sweeney undergoes intense physical changes to play Christy Martin
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In a recent W Magazine cover story, Sydney Sweeney revealed the intense physical transformation she experienced preparing to portray boxing legend Christy Martin. Over three and a half months, she committed to a rigorous routine with weight training in the mornings and evenings, plus kickboxing for two hours midday. This demanding schedule led to a 30-pound weight gain and noticeable changes in her physique. As Sweeney described it, “My b---- got bigger. And my b--- got huge. It was crazy!”—leaving her struggling to fit into her usual clothes, a surprising experience for her.

Sydney Sweeney described her transformation as incredible, saying, “But it was amazing: I was so strong, like crazy strong.” Directed by David Michôd and co-written with Mirrah Foulkes, the untitled biopic charts Christy Martin’s rise as the 1990s’ most famous female boxer, alongside the chilling 2010 attempt on her life by her husband, promising a story of strength and survival. Beyond the boxing ring, Sweeney got candid about her work on Euphoria, revealing surprising insights about her character.
Sydney Sweeney offered revealing insight into her character, Cassie’s emotional journey in Euphoria’s upcoming third season. Unfiltered and bold, she candidly expressed where Cassie’s mindset currently resides, promising a complex evolution ahead.
Inside Sydney Sweeney’s take on Cassie’s mindset in Euphoria
Sydney Sweeney, a two-time Emmy nominee, hinted that her Euphoria character, Cassie Howard, is about to get even more chaotic in Season 3. On The Tonight Show Starring Jimmy Fallon, she described her character as “Cassie is crazy.” When Fallon asked if she was still that way, Sweeney playfully responded, “Oh, she’s even worse.” While she kept plot details under wraps, fans can expect Cassie to bring even more drama and wild moments in the new episodes.
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After Jimmy Fallon mentioned a leaked on-set photo of Sydney Sweeney in a wedding dress, she dodged spoilers about Cassie’s possible nuptials, joking it might be AI-generated. Season 2 saw Cassie’s messy affair with Nate, leading to a fiery stage fight at her sister Lexi’s play. Nearly three years later, Season 3 began filming amid rumors the show might end. With Euphoria breaking the internet and Sweeney dazzling at the Echo Valley premiere, plus her striking biopic transformation, she continues to steal the spotlight as excitement builds.
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What do you think about Sydney Sweeney’s transformation revelation? Let us know in the comments below!
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Edited By: Itti Mahajan
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