Sydney Sweeney recently detailed her intensive diet regimen that helped her pack on 35 pounds for her role in the boxing biopic Christy.

Discussing the preparation on Sirius XM on Wednesday, October 29, Sweeney described the experience as a “massive challenge.” She elaborated, “Portraying the emotional journey through [Christy’s] life involved significant growth, pain, and understanding.” She continued, “The physical transformation I underwent was equally demanding.”

Sweeney revealed that she was given “approximately two and a half months to prepare, during which [she] gained 35 pounds.”

“It required extensive preparation,” she said, adding humorously, “I was consuming everything in sight.” Pointing to her fellow cast members, she laughed, “They dubbed me ‘Smuckers’ on set because of my obsession with [Uncrustables].”

Last year, Sydney Sweeney captured public attention by sharing behind-the-scenes photos from her role as Christy Martin. Now, she’s opening up about her transformation process. “I truly loved it,” Sweeney, 27, revealed in an interview with W magazine, published on Monday, June 9, noting her significant weight gain of over 30 pounds.

She added that she drank “so many protein shakes,” which she didn’t quite enjoy. “I would just plug my nose and down them. Ugh, it was a lot,” she reminisced. Sweeney also nodded when she was asked if she had a lot of “egg whites” and “chicken.”

Elsewhere in the interview, the actress opened up about the “immense weight” she took on while playing Martin, now 57.

“Christy’s story is beyond important to tell. She is inspiring and an ultimate underdog. She completely changed the way that women in sports and boxing have gone on in time past her,” Sweneey said. “I knew that every single detail that was going to go into this, every choice that I made, was going to be an important one. Having Christy by my side during it was the biggest gift I could have asked for.”

She then gushed about her relationship with Martin, saying, “I always felt like I could turn to her for everything. She gave me some really great pointers when we were fighting. She would yell at me different swings I needed to do.”

Sweeney previously opened up about her physical transformation, telling Vanity Fair in September that she felt “very strong and powerful.”

“I loved it. Being able to lose myself to become a vessel for somebody else is my dream,” she explained.

The actress, who trained in jiu jitsu, grappling and kickboxing as a teenager, added that it took her some time to learn proper boxing stances and techniques.

Sydney Sweeney loved transforming her body for her upcoming Christy Martin biopic. “I felt very strong and powerful,” Sweeney, 27, told Vanity Fair in an interview published on Thursday, September 4. “I loved it. Being able to lose myself to become a vessel for somebody else is my dream.” The actress gained between 30 and […]

“You square up differently, and, of course, you don’t get brought to the ground — everything’s on your feet,” she explained.

She added that her figure was “completely different” from how she normally looks. “I didn’t fit in any of my clothes.,” Sweeney said. “’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,’” she said.

The Anyone But You star added that she felt proud of herself and that it was an “amazing” experience. “I was so strong, like, crazy strong.”

Christy is set to premiere in theaters on November 7.