These days Rani Mukerji is on a weight losing spree with her intending to reduce 12 to 13 kgs for Yash Raj Film’s Mardaani in which she will play a police officer for the first time in her career. The actress is training under physical trainer Samir Jaura who is also preparing Priyanka Chopra for the Mary Kom biopic. Observes Juara in a statement, “I'm training Rani for Mardaani as she has to lose around 12 to 13 kgs for the film. Having started training two weeks ago, she has already lost 3 kgs." Incidentally, Juara is also behind the macho and fit look of Farhan Akhtar in Bhaag Milkha Bhaag. To be directed by Parineeta fame director Pradeep Sarkar, Mardaani is supposed to be raw and gritty something that Sarkar and Rani have never done before. It is said that the film will be the boldest film till date from the YRF stable. It is likely to go on floors by this year end (2013). Rani's last outing for the banner was Dil Bole Hadippa that failed to create magic at the box office.