Matching Rajnikanth's agility is no mean feat for any of his leading lady. Hence director Shankar wants Aishwarya Rai Bachchan to get in shape real soon before she starts shooting with the superstar in his sci-fi flick Robot.

Although the actress had put on some weight for her role in Jodhaa Akbar, she is working hard on her figure now. According to the source, Ash's current diet comprises sprouts and liquids like juices and soups.

Shankar is very particular even about the smallest details in his films. He has churned up some of the biggest hits like the Rajnikanth starrer Sivaji and the Kamal Hassan starrer Hindustani. He wants to leave no stone unturned for Robot too.

So Aishwarya has already started to loose weight, through gymming and dieting, ending recent tabloid speculation that she is pregnant and has withdrawn from the film.

Meanwhile, the release of Aishwarya's next film, Ram Gopal Varma directed Sarkar Raj, has been delayed because Amitabh Bachchan is not happy with the way the climax, featuring him and Abhishek Bachchan, was filmed and has asked Varma to re-shoot it.