Sydney Sweeney reveals intense training routine for upcoming biopic ‘Christy’

Sydney Sweeney is opening up about the hard work that went into her drastic transformation to play female boxer Christy Martin in the forthcoming biopic Christy.

During a Q&A session at the Hamptons International Film Festival on Saturday, October 4, where Sweeney was also honoured for her performance, she shared details about her diet and exercise routine.

"Every morning I would weight train for an hour, then I would go and do boxing for three hours, and then another hour of weight training at night. I did that every single day for three months, with a nutritionist, so eating a bunch of food and protein shakes and supplements. I, in that span of time, gained, like, 35lbs," she revealed.

The Anybody But You actress also shared that Martin herself was fully “involved” during the making of the biopic.

"She kind of became my best friend. Having her with us was a really powerful experience,” Sweeney continued.

"I've never had the person who I'm portraying watch me. You're never really sure what they're thinking. But as it went on, I just wanted her there the entire time because I was able to study her and listen to her and have her thoughts and opinions there whenever I needed," she said of her unique on-set experience.

Towards the end of the discussion, Sweeney reflected that she had the privilege of learning a lot from Martin, lessons she has "applied” to her own life.

It is worth noting that Christy is slated to hit theaters on November 7, 2025.