On set for Euphoria, Sydney Sweeney owned her cravings. Lunch looked like Chick-fil-A. Breaks looked like entire pizzas. Fans saw the proof on her Instagram Stories and, yes, people couldn’t stop talking about it.

At the Toronto Film Festival, she laid out the plan. There were protein shakes, Smucker’s milkshakes, and a heroic number of PB&J sandwiches. Trainer Grant Roberts confirmed the sandwiches and the strategy. Hit the protein target first, then loosen the “clean” eating to add believable softness where the character needed it.

She also used creatine. It helped her train harder, but she joked that it “just makes you bloated.” Multiple shakes a day kept the calories high, though they left her feeling full all the time. The vibe on Instagram and X was almost a live diary: shakes in hand, pizza boxes nearby, and a boxer’s hunger to match.

How did Sydney Sweeney train for the role?

Sydney told W Magazine she trained for three and a half months before the cameras rolled. Mornings were a focused hour. Lunchtime turned into two hours of kickboxing. Evenings added another hour of weights. Some days doubled up. Because why rest when you’re chasing a champion?

Between takes, she lifted in costume—red-and-white trunks, curly brown hair—curling hot-pink eight-pound dumbbells like a woman possessed. Roberts handled the rest of her week with meticulous planning. Think double sessions, 3D body scans, and composition checks. The goal wasn’t a bodybuilder silhouette. They wanted a believable ring strength. Translation: more smart food, not less.

If you’ve followed the gym clips on her Stories, you’ve seen the rhythm. Mitt works. Footwork. Lifts. Sweat. Repeat. It felt like a mini-camp living right inside a movie set.

Sydney Sweeney’s body transformation: numbers, sizes, and surprises

Here’s the headline number: 34 pounds, not 30. Roberts says about two-thirds was muscle. That’s wild. Sydney Sweeney said none of her clothes fit by the end. She went from a size 23 to a size 27, and the change showed everywhere—stronger shoulders, fuller chest, and a glute shelf that looked athletic, not just “added weight.”

At 5’3″, she became compact dynamite. Roberts worked with her for around 12 months overall, steering the build, the maintenance, and the mental side. Imagine reshaping a famously petite frame and still keeping agility. That takes planning and a lot of trust.

When filming wrapped, she reversed course. She dropped 30 pounds in seven weeks by cutting the shakes and creatine. Stop training that hard, and muscle trims fast. She was honest about it. Bodies change with the work you ask of them. Hers just happened to do it on a deadline.

Who is Christy Martin—and why this story hits harder

Christy Martin isn’t just any boxer. She’s the 1990s icon who kicked doors open for women’s boxing. A pro since 1989, she later grabbed super welterweight world supremacy in 2009. She signed with Don King, landed the Sports Illustrated cover, and eventually entered the International Boxing Hall of Fame. That résumé alone is a movie.

Her life outside the ring was brutal. In 2010, Christy survived an attack by her husband, James Martin, who stabbed and shot her in their Florida home. He was convicted of attempted murder and received 25 years. Christy still fought—through recovery, through trauma, and through the sport’s dismissive gatekeeping—no wonder Sydney called the role both physically and emotionally gruelling.

Sydney told Deadline that Christy’s story felt like a mission. It challenged gender stereotypes and spotlighted the violence women face—physical, emotional, even financial. That’s a lot to carry into a performance. It’s also why the biopic releases November 7, 2025, with the weight of a legacy behind it.

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So… how did the performance land?

Toronto gave her a standing ovation. Critics and fans tossed around “Oscar-worthy,” and the room felt electric. Sydney Sweeney got emotional and thanked Christy directly. Christy, ever the fighter, praised Sydney’s seriousness and called her a perfectionist. You could feel the respect flowing both ways.

Roberts swears the transformation stuck around, too. He points to rounder shoulders, sculpted arms, and a stronger glute line even after the cut. Opening weekend numbers came in soft, but Sydney stood by the film on Instagram. “I am extremely proud of this film,” she wrote. Art doesn’t always chase applause; sometimes it throws a punch that lands later.

Could this be her first Oscar nomination? The commitment alone makes the case. She changed how she ate, how she trained, and how she moved—just to tell Christy’s story right. Isn’t that what great acting looks like?

Stay locked on ShowsBuzzz for more celebrity physical transformations, real-talk reviews, and daily entertainment buzz. We’re watching the awards chatter like hawks—are you?