Sydney Sweeney shows off muscular frame in Florida after bulking up to play boxer in new biopic

Sydney Sweeney showed off her muscular physique on Friday afternoon after bulking up to play boxing legend Christy Martin in a new biopic.

The actress, 27, rocked a stretchy black one-piece as she enjoyed a sunny stroll with her shirtless fiance Jonathan Davino, 41, and pals near her $13 million Florida Keys mansion.

She had a black sweatshirt tied around her trim waist and a baseball cap over her wavy blonde hair.

The Euphoria star appeared makeup-free and kept a pair of designer shades over her blue eyes.

To complete her athletic look, Sweeney threw on a pair of stylish lace-up sneakers.

Sweeney has been hunkered down in Florida while enjoying a brief reprieve from her busy Hollywood schedule ahead of the Christmas holiday.

Sweeney's hunky fiance trailed behind her wearing a white baseball cap and black shorts during their afternoon stroll.

The couple began dating in 2018 and Davino popped the question in 2022.

In regards to weddings plans, Sweeney explained late last year in December that she hasn't had much time to begin sorting details for the nuptials.

'I am so busy working! I'm a workaholic and I love it, I love it,' she told Entertainment Tonight.

The couple have also worked together in the entertainment industry.

While Sydney starred in the romantic comedy, Anyone But You (2023) with Glen Powell, the star also co-produced the film with Davino through her production company Fifty-Fifty Films. 

She called the experience working with Davino 'incredible' and recently shutdown rumors that her soon-to-be-husband funds her lavish lifestyle and film projects.

'I'm a very successful, independent woman who's worked really hard,' the actress told Glamour. 'I've accomplished and bought everything myself, and I provide for myself and my family.'

'I would love to set the record straight. You can be in a healthy relationship with someone and also be very successful without needing the man.

'We're teammates. We're in it together. And we want to see each other succeed,' Sweeney concluded.

The couple's Florida getaway comes just weeks after she wrapped production on the highly-anticipated Christy Martin biopic, which chronicles Martin's rise as America's top female boxer in the 1990s.

To signal to fans that filming has wrapped, Sweeney posted a touching tribute to Martin and shared photos of her incredible physical transformation for the film.

Instead of her blonde bombshell curls and busty frocks, Sweeney embraced a gritty, athletic look for the film and bulked up her typically slender frame. 

She also included a snapshot of herself with Martin, 56, on set in the post.

In the caption, Sweeney described the experience as 'one of the most emotional, transformative' of her life, praising Martin's resilience.

'Christy's journey is so deeply inspiring, and having her by my side during this process was nothing short of surreal, she wrote. 'Knowing what she's endured, what she's pushed through to be there in that moment—it made me want to cry.' 

Sweeney also thanked the cast and crew, and expressing her excitement to share a story that is 'bigger than just a film'.

'It's a testament to resilience, survival, and finding the strength to keep fighting. I can't wait for you all to see it—not only because I'm proud of the transformation and the work I've poured into it, but because Christy's story deserves to be told.'

She quipped, 'And yes, you'll get to see me kick some serious a** (like seriously kicked some a**) ((like I might've enjoyed it a little toooooo much while kicking a** haha)), but most importantly, you'll witness a story that's as powerful as the woman who lived it.'

'I'll carry this experience with me forever. Can't wait to share more :)'

The peek into the production comes after Sweeney, who practiced combat sports as a teenager, shared that the film gave her the perfect chance to rekindle her passion for the ring.

'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,' Sweeney told Deadline recently.

'Christy's story isn't a light one; it's physically and emotionally demanding... But I love challenging myself.

'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.'

The film, directed by David Michod, follows Martin's rise to prominence in the 1990s as America's top female boxer.

Sweeney signed on to play Christy Martin back in May, with Michod (Animal Kingdom) directing from a script he co-wrote with Mirrah Foulkes.

The cast includes Ben Foster, playing Martin's husband, James, along with Merritt Weaver, Ethan Embry, and Katy O'Brien.

Nicknamed 'The Coal Miner's Daughter' in honor of her father's roots, Martin hails from West Virginia and is widely credited with bringing women's boxing into the spotlight.

Her iconic 1996 face-off against Deirdre Gogarty at the MGM Grand in Las Vegas captivated a packed arena, cementing her place in boxing history.

Martin's success led to appearances on the cover of Sports Illustrated, guest spots on major talk shows, and even cameos in American sitcoms.

Yet, away from the limelight, her life was far from the picture of success.

For 20 years, she endured abuse from her husband and trainer, James 'Jim' Martin.

In a chilling assault on November 23, 2010, Jim stabbed Christy multiple times and shot her once in the torso, leaving her for dead following a heated argument at their home. Remarkably, Christy survived.

In June 2012, Jim was sentenced to 25 years in prison for attempted second-degree murder and manslaughter.

Today, Christy has found new purpose as a boxing promoter and married her former ring rival, Lisa Holewyne, in 2017.

Her journey as a boxer and survivor has transformed her into an enduring symbol of resilience.

She went on to become the first woman inducted into both the Nevada Boxing Hall of Fame (2016) and the International Boxing Hall of Fame (2020), wrapping up her career with a 49-7-3 record.

Currently in post-production, the release date for the film remains unannounced.