Scarlett Johansson has credited playing tennis for keeping her in shape.

The actress instantly fell in love with the sport while filming Match Point with Woody Allen.

"Tennis is great. You don't even notice how much you run," she told Shape magazine. "You get a nice body, taut legs and great butt.

"Every day I had to practise on the tennis court - and I'd never held a racket before. I'll keep on playing if I find a good partner. But I want to win every time. I am very ambitious."