Scarlett' secret for sexiness? Eat Kale! Captain America actress on keeping her figure, doing her own stunts, and the pressures of fame

Scarlett Johansson wants to make something clear. The majority of her character’s daring stunts in Captain America: The Winter Soldier were performed by her. Only the most dangerous were left to doubles.

‘It’s important people know that,’ she says. ‘If you just hand over to the experts when the going gets tough, I don’t think you are fully embracing the part.

‘I like doing the stunts. Oh, sure, it hurts sometimes. I came into work on Winter Soldier some days aching with bruises and bangs, and Samuel L. Jackson, my co-star, would say: "So why not just hand over that stuff to the experts, Scarlett, and save yourself from pain?"

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Superhuman: Scarlett Johansson as Natasha Romanov, AKA Black Widow, in Captain America: Winter Soldier

‘I explained to him why I just couldn’t do that.

‘Please don’t think I’m stupid, though. I know my limitations. When Natasha, my character, has to bound 20ft in the air and do four cartwheels, it’s my stunt double Heidi Moneymaker who’s doing that.