Sandra Bullock has admitted making her movie Gravity was "body and mind-changing".
The Blind Side actress plays an astronaut stranded in space in the Oscar-tipped movie, which also stars George Clooney, and revealed the physical and emotional challenges of the shoot taught her a lot about herself.
"Going into this film, I had no idea what I was capable of on so many levels, physically, emotionally and mentally," she said. "It was body-changing, mind-changing, mind-bending."
Some of the challenges Sandra faced included the Light Box, an elevated LED box "in a sea of blackness" in which she would be clamped from the waist down, and working with a movement coach to achieve the zero-gravity effect. There was also a wire system "where you're basically being manipulated by puppeteers to simulate flying around space", she explained.
Sandra also spent the majority of the shoot alone, with no human connection other than voices coming through her earpiece.
"But I'm glad it was done that way, as whenever I started to become panicked, lonely or at a loss, I was like, just use it, use it..." said the 49-year-old.
The actress admitted the tough shoot proved to be beneficial.
"I loved it. I mean, I didn't love it while we were making it, every day was uncomfortable, but I appreciated that," she said. "I appreciate not being in my comfort zone, because that means I've got as far away from myself as possible. And I learnt that unlocks things that scare you, frustrate you, makes you feel so insecure, but it also forces you to dig very deep."
But Sandra confessed she was happy she didn't have to tackle one fear, shooting in the 'Vomit Comet', a plane that plummets out of the sky to achieve weightlessness.
"I'm afraid of flying, it's one of my greatest fears, so I thought it was maybe time to get over that, but I was grateful we didn't do it that way," she smiled.
Gravity, directed by Alfonso Cuaron, is in cinemas now.