Anne Hathaway has been “platypus walking” to get in shape.

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The Devil Wears Prada star needed to tone up for her role in new movie Bride Wars and her personal trainer David Kirsch recommended the unusual exercise to help her achieve a svelte look.

Explaining the benefits of the ‘platypus walk’, David told America’s Glamour magazine: “It lifts the butt up a good inch higher, working the inner thighs.

“She really wanted to sweat. It de-stressed her.”

The platypus walk is a squat-like walk done while holding a medicine ball above the head.

Meanwhile, health-conscious Anne recently revealed her favourite foods.

She said: “If I could only eat one thing for the rest of my life I would choose sushi, because you can prepare it in several different ways and it is so healthy.

“I also love broccoli with brown rice.”

Anne stars alongside Kate Hudson in the new movie, about two best friends who organise their weddings for the same day.