Rachel Weisz signed up for 'The Bourne Legacy' because it was ''realistic''.

The 41-year-old actress thinks audiences will ''identify'' with her character Marta in the blockbuster - in which she stars opposite Jeremy Renner - and loved seeing her on-screen Alter Ego's transformation from scientist to ''warrior''.

She said: ''I really like the idea of an action movie that is realistic, rather than a superhero movie or people with magic powers.

''And I thought she was a very well-drawn, complicated character, which you almost never get in a genre picture.

''As Marta, I'm a civilian - a scientist. I have a gun because I live alone and this is America.

''I love that as an audience member you can identify with her and think, 'That could be me. What if I was in that situation?' You get to see the Evolution from normal bod to action heroine - she becomes a kind of warrior. And she gets put through a lot.''

Rachel admits she has made some ''ridiculous'' career decisions in the past and says trying to plan her movies never goes according to plan.

Asked if she ever had a game plan, she said: ''Yes but it never worked out. I've had times when I think I want to do something specific next. After 'The Constant Gardener' I wanted to do a comedy. I just couldn't take anything else intense for a bit.

''So I turned down everything to do a comedy, which is a ridiculous game plan. And then a role comes along that you never thought of doing, and you connect with it, and you end up doing it.''