In the "Twilight" series, Kristen Stewart was able to get away with just some slow dancing at her high school prom. For "On the Road" and the free-spirited character Marylou, however, she was going to put in a little extra effort.

MTV News' Josh Horowitz sat down with Stewart for her only one-on-one interview at the Toronto International Film Festival, and she told us how Marylou got her groove.

Stewart was largely on her own when it came to the film's big dance sequence, something Jack Kerouac didn't describe at length in his novel. "We rehearsed a lot," Stewart said. "That scared me so much, especially the way it comes in the book. It's just one little line. Dean grabs Marylou, and they do a love dance. People watch, and then it's on to the next thing. They toss her around. What is a love dance, you know what I mean? That's so intimidating. I don't dance."

For the actual scene, Stewart did have help, though, in the form of co-star Garrett Hedlund, who plays Dean Moriarty in the film. "[Garrett and I] rehearsed it quite a bit, but nothing was choreographed," she said. "Me and Garrett would get together every weekend and dance to incredibly fast jazz music. At first, it was really embarrassing, ridiculous and horrible, let me tell you."

Unfortunately, practicing wouldn't be all Stewart needed for the scene. It required some serious stamina. "When we shot the scene, we did it four times, and the song is four minutes long," she said. "I'm shocked I didn't pass out repeatedly. By the end of every single one, I was so completely dizzy. You can see my face. I'm as red as a fire truck. I can't even breathe. A room smaller than this full of 60 people. The floors really were bouncing. It was so cool."

As for the other skill Marylou shows off in the movie — expertly rolling a joint — Stewart gives props to the prop master. "I'm a skilled actor. I had a really brilliant prop master, who could do it with one hand. I can't do that."

Check out everything we've got on "On the Road.".