Fitness trainer Rakesh Udiyar, who had worked with Aamir Khan in Dangal and Salman Khan in Sultan, is currently working with actor Ram Charan for his upcoming Telugu action-thriller Dhruva according to sources. Udiyar is said to be working with Charan for the introduction song Dhruva Dhruva. “Diwali eve killing it in the gym with my trainer #Rakesh Udiyar. Getting ready to shoot the title song of Dhruva from November 2. #Stayinspired #HappyDiwali,” Ran Charan posted on Facebook. A remake of Tamil blockbuster 'Thani Oruvan', the film also stars Rakul Preet Singh and Arvind Swami. On Monday, Ram Charan’s wife Upasana posted on her Twitter page a video of her husband working out, and it has already gone viral. Music has been composed by Hiphop Tamizha, who also composed for the Tamil original and cinematography is by P S Vinod. Directed by Surender Reddy, Dhruva is gearing up for December 2 release.