NPR with Noomi Rapace:
To prepare herself physically for the role, Rapace put herself on a diet, cut her hair and colored it black, then got all those piercings. She wanted to be more masculine, she says, a bit flatter and more boyish in her body. Before shooting the film, she underwent a rigorous regimen of kickboxing and Thai boxing, four or five days a week for seven months.
"I wanted to do my [own] stunt scenes," she says. "And I wanted also to wake up some kind of aggressive side in me. I think that everybody has some kind of animal inside, and sometimes it's good to let it out."
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