Arnold Schwarzenegger thinks action movies shouldn't be ''serious''.

The 65-year-old legend believes humour has to be retained in the genre, while still gripping audiences with a ''great story.''

He said: ''Action movies are not meant to be serious. It's not like my old films were set in Berlin in 1943 against some historic event. That has to be done seriously.

''But with us it was like, 'Hey, let's blow up some cars, let's kill some people, let's swing through the trees, blow up a building and move on.'

''And in the meantime we wanted to tell a great story that sucked people in emotionally, so that's what it is about. It lends itself to humour.''

The action star revealed he had no interest in returning to acting when he was working as Governor of California, especially after visiting Tom Cruise on the set of 'War of the Worlds' where he found the star performing an extreme stunt, suspended upside down in a harness.

Schwarzenegger added to Shortlist magazine: ''And you think, 'What the f**k is this?' I was happy to be out.

''Then the governorship ends and I get sucked back in. Next thing I know I'm on a set and I'm standing in the cold and the dark freezing my ass off.''