After a disappointing stint with Ayya, Rani Mukherjee is now busy getting ready for a very powerful role in Pradeep Sarkar’s next film, Mardaani. She will play the role of a Police Officer and is required to lose 12 kgs for the role to look fit. Samir Jaura, the busy fitness trainer in Bollywood now who also trained Priyanka Chopra for her Mary Kom and Farhan Akhtar for Bhaag milka Bhaag, is actively training Rani on the same. "I’m training Rani for ‘Mardaani’ and she will be losing around 12 to 13 kg for the film. We started training two weeks back and she has already lost 3 kg," said Jaura. Rani earlier played a very bold role in the film Ayya, where she falls for a South Indian boy. The song “Dreamum Wakupum” went on to become a chartbuster with her gutsy sensual moves in the song. The film however bombed at the box office and our talented lady sure needs a hit to turn things around. And as they say, she is sweating it!