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Weaver also revealed that she took inspiration from Vanessa Redgrave, who had been successful in an industry full of "little, blonde, blue-eyed" stars.
"In a way it was better that I was a bit freaky, because it took an unconventional director to think of me, and that kept me from humdrum movies."
The actress added that keeping up with the long days in Hollywood required incredible stamina.
She also said it was "empowering" to feel her own strength, and that a lot of women were in better shape now because they cared about it more.
Weaver was speaking ahead of the release of her new film, sci-fi action thriller Chappie, co-starring Australian actor Hugh Jackman.
* Chappie is released in New Zealand cinemas on March 12.
- PAA