Actress Sydney Sweeney fueled her role as Christy Martin with milkshakes, Chick-fil-A, and protein shakes during intense training

Diet That Packed on the Muscle

September 6, 2025: To fully channel legendary female boxer Christy Martin in her new biopic Christy, Sydney Sweeney followed a striking and unconventional diet. As she prepared for the transformation, she consumed generous helpings of Chick-fil-A, milkshakes, Smucker’s spreads, and protein shakes—all alongside a rigorous exercise routine.

Image Credit: Emma McIntyre/Getty

Training Three Times a Day

Sweeney didn’t just eat differently—she trained differently too. For months, she followed a grueling schedule: morning weight training, midday kickboxing, and evening training sessions—typically three workouts per day, every day, even while filming.

Image Credit: Courtesy of TIFF

The Physical Payoff

The result? A dramatic physical transformation that added both strength and size—helping Sweeney gain the muscular presence Christy Martin was known for. It wasn’t just bulk; it was power, delivered authentically.

Premiere Reaction and Release Info

At the Toronto International Film Festival, Christy premiered to a standing ovation. The real Christy Martin was in attendance, visibly moved by Sweeney’s performance. The film is slated for theatrical release on November 7 via Black Bear Pictures.