Margot Robbie played one of the controversial figures of the 1990s, Tonya Harding, in I, Tonya. But apparently, that came with a lot of workout advice on how to properly skate like you’re one of the top figure skaters in the world.

“It’s scary playing a real life person especially when that person is still very much alive,” Margot told Entertainment Tonight. “Everyone has a recollection of what they think happened, and it’s kind of fun and interesting to show a different side of that story and maybe a side to Tonya that people weren’t expecting to see.”

“I was like, ‘I’ve been working on my legs. I’m trying to get stronger in my legs.’ She’s like, ‘Forget that, worry about your core strength.’ I was like, ‘OK, I’ll do more sit ups,’” she recalled, adding that she did at least 100 sit ups a day.