Sanjay Dutt and Hrithik Roshan will soon start gymming together. Ever since Dutt saw Roshan’s body, post Guzaarish, he is impressed with him and, to get rid of his bulge, has turned to Roshan for help. Dutt now wants Duggu to be his gym mentor. “Hrithik offered the services of his trainer but Sanju wanted to work out only with Hrithik. Besides, there was a comfort factor they had developed ever since they acted in Mission Kashmir,” reveals a source.