Charlize Theron was hanging out in Austin this weekend for the premiere of her new film, Atomic Blonde, at the SXSW Film Festival. Suzanne Cordeiro / AFP / Getty Images On Sunday night, she attended the film's premiere with her co-star James McAvoy and Atomic Blonde director David Leitch. Matt Winkelmeyer During the audience Q&A portion of the evening, Theron was asked about her training regimen leading up to filming — because in case you hadn't heard, she kicks some serious ass in this movie. Denver and Delilah Productions (Like, this fight scene is going to blow your mind.) Tap to play or pause GIF Tap to play or pause GIF Denver and Delilah Productions "It was so hard, are you kidding me?" Theron said with a laugh. "When [training] first started I was like, 'This is never going to work, I look like Big Bird.'" Matt Winkelmeyer / Getty Images Theron trained in Leitch's gym, 87Eleven Action Design, where a certain actor named Keanu Reeves was also training for another film Leitch was directing: John Wick 2. Lionsgate "We would kind of spar with each other," Theron said. "I'd be like, 'Come on, Keanu. Let's take it down.' Shit like that. It was very macho. It was great." This really changes Sweet November forever. Warner Bros.