Gemma Arterton was once filmed in the gym to prove she was exercising for a movie role.

The 31-year-old actress might have an enviable figure, but she has revealed her size 10 waist wasn't enough for one producer who flew a personal trainer out to Morocco specifically to make her lose weight on a film set.

She said: "There was one film that I was on and we were out in Morocco and a couple of weeks went past and they literally were like 'We need a personal trainer - stat.'

"And they flew someone out overnight that gave up their whole life to be with me and be my personal trainer. You know when it's like - 'Is it that f***ing bad that I need an emergency ... [it was as if they were] like on speed dial - 'Get that trainer out here now.'

"It was so traumatic at the time."

The 'Prince of Persia: Sands of Time' star was then pressured by producers to be in the gym late at night, and claims the producers forced her trainer to film her whilst she was working out as proof that she was exercising.

She added: "They'd measure me and they'd call up the personal trainer at like nine at night going: 'Is she in the gym? And if she isn't, why isn't she in the gym?' And then they'd get me in the gym and film me in the gym and they'd have to know that I was there."

And the 'Quantum of Solace' actress was even told she couldn't indulge on some dried apricots by a producer who wasn't in shape himself.

Speaking to The Guilty Feminist podcast, Gemma added: "And there was one day when I went to get some snacks, they have like snacks on set, and I went to get some apricots, some dried apricots. And the man went, this big, fat, obese producer went: 'I hope you're not going to eat that.'"