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There were hints that River had acquired some martial arts and weapons skills, which the film Serenity will develop, Glau said. "I do a lot of wire work, so I get to do a lot of flipping and running up walls, so it's really exciting," she said. "I'm not a gymnast. I still don't like being upside down. If I don't know what my legs are doing up there, it makes me nervous."

Glau added, "When they first met with me to try to figure out what my physicality was, we went over things, and what we ended up with is kind of a blend of wu shu, kung fu and kick boxing. It's kind of tailored to my abilities, because I was a ballet dancer before I started acting. And so, you know, looking at the way I moved and seeing what kind of a body type I had, that's what they chose."

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