Actress Sydney Sweeney has recently concluded an intense period of physical transformation in preparation for her role as legendary boxer Christy Martin in the upcoming biopic "Christy." The 28-year-old actress gained approximately 35 pounds in late 2025, a feat that involved a committed regimen of weight training, boxing, and a high-protein diet including "protein shake after protein shake," as Sweeney described.
"I wanted to create a place where women can move between all the different versions of who we are," – Sydney Sweeney on the motivation behind her lingerie brand, SYRN.
Her dedication to authentically portraying the boxer extended to converting her grandmother's backyard shed into a gym, where she trained multiple times per day with boxing and strength coaches. The grueling preparation was not without its toll; Sweeney admitted to experiencing bloody noses and a concussion during the filming of fight scenes.
Following the completion of production, Sweeney embarked on a swift weight loss journey, shedding over 30 pounds in a mere seven weeks. The rapid change was attributed to a cessation of the extreme calorie intake and the supplements that had been integral to her muscle gain. Sweeney's return to a slimmer figure was showcased at the 2025 GQ Men of the Year event, where she was awarded Actress of the Year.
Her return to the spotlight continued with appearances at the Governors Awards and premieres for her next film, "The Housemaid." Sweeney's red carpet looks have harkened back to classic Hollywood glamour, with nods to style icons like Marilyn Monroe and Pamela Anderson.
Simultaneously, Sweeney has been rolling out her new lingerie brand, SYRN, announced on social media with a launch date of January 28. She revealed her personal connection to the brand, citing her own experiences with body image from a young age and her dissatisfaction with available lingerie options. The SYRN brand promises to accommodate different body types and reflect the multifaceted lives of women. The actress emphasized the empowering aspect of lingerie that allows women to express their femininity on their own terms.
The promotional launch of SYRN has featured Sweeney in a variety of lingerie styles, highlighting the brand's commitment to versatility and comfort. With this latest entrepreneurial move, Sweeney is expanding her influence beyond acting, merging her personal experiences with a business that champions inclusivity and self-expression.
