David Higgins, who is Margot Robbie’s personal trainer, recently talked about how the cast of Barbie trained before filming began.

Higgins, who has been working with Robbie since 2015, told GQ magazine that he helped Ryan Gosling, Emma Mackey, and Simu Liu look like Barbie and Ken dolls by using Pilates, group workouts, and weight training.

Higgins said that he had previously worked with the stars of Marvel’s Eternals and DC’s Justice League, which he found “interesting” because of their “different levels of fitness.”

The trainer said of the Barbie movie, “It created a ‘we’re all in it together’ kind of feeling, which helped with motivation. If one person was struggling, another might come around and say, ‘Come on, let’s do this.’ I really loved this group of guys; they’re so positive and up for it.”

Higgins said that the Kens’ trainer did “weights and Pilates” with them and that they also did “dance training” for the “choreographed sequences” in Greta Gerwig’s film.

“Everyone was just having a good time,” the teacher said.

Higgins also said, “No one was sad.” It wasn’t just about training for one naked scene but for the whole movie. That doesn’t mean they didn’t give it their all, though.

The trainer also gave the group dietary rules, such as not eating processed foods and fasting for short periods of time.