Sydney Sweeney underwent a dramatic physical transformation to portray professional boxer Christy Martin in an upcoming biopic set to premiere this fall. The actress revealed how rigorous training and significant changes to her body were essential for capturing Martin’s strength and athleticism, showcasing her dedication to the role and the film’s authenticity.
Sydney Sweeney Describes the Physical Changes She Experienced
For Sweeney, the transformation was nothing short of remarkable. She told W Magazine,
“I didn’t fit in any of my clothes. I’m usually a size 23 in jeans, and I was wearing a size 27. My boobs got bigger. And my butt got huge. It was crazy! I was like, ‘Oh my God.’ But it was amazing: I was so strong, like crazy strong.”
—Sydney Sweeney, Actress
The shift in her physique highlights just how much she committed herself to embodying the fighter, emphasizing not only muscle gain but also the development of a boxer’s powerful frame.
Details of Sydney’s Training Regimen and Athletic Background
Sweeney shared the demanding schedule she followed to prepare for the role, involving more than three months of intense workouts. She explained,
“I came onboard to play Christy, and I had about three and a half months of training,”
followed by,
“I started eating. I weight-trained in the morning for an hour, kickboxed midday for about two hours, and then weight-trained again at night for an hour.”
This intense routine helped her build the endurance and strength needed to portray a professional boxer authentically.
Her athletic lifestyle extends beyond the film. Sweeney reflected on her past sporting experiences:
“I love sports. I love being outside. I was on the ski team, and I wakeboarded,”
continuing to say,
“I slalom ski on water. I was on the soccer team and the softball team. And then my parents got me into grappling, which is like wrestling, and kickboxing. I was the only girl at the dojo. I trained there from 13 until about 19. I fought all guys. I liked to think that if sh—t went down, I might be able to step up.”
—Sydney Sweeney, Actress
These sports experiences contributed to her readiness to perform in such a physically demanding role.
First Official Glimpse of Sydney Sweeney as Christy Martin
The first official look from the Christy Martin biopic debuted ahead of its world premiere at the Toronto International Film Festival (TIFF) this September. Sydney appears in the ring clad in a white tank top and shorts, paired with red boxing gloves, reflecting the authentic boxing attire of the athlete she portrays. This preview gives audiences a clear view of her remarkable transformation and the intense preparation that preceded it.

Sydney Sweeney’s Upcoming Projects Beyond the Biopic
Besides the Christy Martin film, Sydney Sweeney is also venturing into a new genre with a role in a horror movie inspired by a viral Reddit short story. The film stems from a chilling tale titled
“I pretended to be a missing girl so I could rob her family,”
authored by Joe Cote on Reddit’s r/nosleep forum, which features first-person perspective horror stories that engage readers as if they are real. This next project highlights Sweeney’s range as an actress, moving from sports drama to psychological horror.
The Impact and Significance of Sydney Sweeney’s Transformation
Sydney Sweeney’s dedication to the Sydney Sweeney Christy Martin transformation illustrates the lengths actors go to portray real-life figures with accuracy and respect. Her intense preparation, combined with her athletic background, not only contributes to the film’s credibility but also raises expectations for her performance. The film will likely inspire conversations about women in sports and the challenges they face, while Sweeney’s physical transformation showcases the demanding nature of embodying such a powerful figure.
As the biopic premieres at TIFF in September, audiences will witness how Sydney’s commitment to this challenging role brings Christy Martin’s story to life in a vivid, compelling way. Fans and critics alike will be watching closely to see how this transformation translates to the big screen and what stories Sydney chooses to explore next in her diverse acting career.
Our Reader’s Queries
Q. How did Sydney Sweeney get big?
A. Sweeney shared with the publication that she joined to portray Christy and went through around three and a half months of training. She mentioned she changed her diet, did weight training for an hour in the morning, kickboxed for about two hours at midday, and then finished with another hour of weight training in the evening.
Q. Why did Sydney Sweeney call off the wedding?
A. According to the source, Sweeney’s hectic work schedule has impacted their relationship. They mentioned she has little free time, which creates stress between them. Sydney is very career-driven, and Jonathan hopes they could enjoy more time together.
Q. How many hours does Sydney Sweeney sleep?
A. Sydney Sweeney has never had coffee but can still manage with just two hours of sleep.
Q. Did Sydney Sweeney gain muscle?
A. In a Monday interview with W Magazine, a Euphoria actress talked about her intense schedule to play a boxer. Sweeney trained for three and a half months, resulting in her gaining more than 30 pounds for the part.
