Anna Kendrick has revealed she was surprised by how physical her acting was in new animated movie Paranorman.
The Twilight star plays Courtney in the adventure comedy, which also features the voices of Casey Affleck, Christopher Mintz-Plasse and Leslie Mann.
She told Collider: "Just how physical it was (surprised me) - I was throwing myself around in all these ugly positions, Casey Affleck said they should get like a knee cam for my knee acting because I was doing a lot of knee acting."
The actress added: "What surprised me was how much they wanted us to improvise, because I just assumed that wasn't the nature of animated films, and for them those moments of spontaneity are the things that help them from letting it get stale when they're animating it slowly and meticulously."
The actress said the end result of the movie - about a little boy who takes on zombies and ghosts to save his town from a curse - is "stunning".
"Obviously I knew the people involved in it, I knew it was going to be beautiful and I just couldn't believe how visually stunning it was, especially when it gets into the third act it crescendos in this way that I didn't know it was going to feel like, the scale got so much bigger," she said.
"There are moments in the third act where it feels like the whole fabric of the universe is coming apart."