Weisz: Running was hardest part in new Bourne film

Rachel Weisz thought the most difficult part of starring in the 'The Bourne Legacy' was to stop running like a girl.

The 42-year-old actress portrays scientist Marta Shearling in the forthcoming action film, and she had to work hard to run in a more masculine way in scenes which see her alter-ego and lead character Aaron Cross (Jeremy Renner) attempt to avoid being hunted down and killed.