Melbourne, March 29 : Reese Witherspoon had to toil real hard on her voice for her role in the movie “Monsters Vs Aliens”, especially when movie bosses wanted her to sound like Arnold Schwarzenegger.

The Oscar-winning actress stressed on the need to depict voice transition for her role as a Modesto native who later becomes 49 ft 11 in tall after being struck by a glowing meteor.

"One of the hardest parts of doing the movie for me was the voice I had to use when I was really big,'''' the Daily Telegraph quoted her as saying.

"You know, I go from being a kind of docile character, very meek, to being this amazing kind of female superhero, and they wanted me to sound like an action star.

"They wanted me to sound more like Arnold Schwarzenegger, which is really hard for me,'''' she added. (ANI)