https://www.youtube.com/watch?v=E11KpU4CMWU

Jessica Chastain got quite an eloquent athletic training while filming zero-gravity scenes in "The Martian."

"It was fun," the actress told Made In Hollywood with a smile. "It was like a ballet."

The process, however, was no simple one.

"I had four wires on, a team of people on the pulleys and we had to choreograph it," Chastain said. "We worked on it for weeks because it had to look like the movement was initiated by me, when in fact, I had no control over the movement. And if I did push off too much, I would start swinging, which then ruins the entire effect."

But the carefreeness of the whole experience made her feel like "five years old."

Chastain plays Melissa Lewis in the film about astronaut Mark Watney (Matt Damon) being left all alone after presumed dead during a mission to Mars.

The Ridley Scott-directed, critically acclaimed sci-fi hits theaters today.