Aamir Khan left with his wife Kiran Rao and son Azad for Chicago recently, for Dhoom 3 shooting. It said that the makers have planned to shoot an action sequence between the lead actors Aamir and Katrina at Chicago. Aamir Khan has already begun his marital arts practice for the film. The actor has begun shooting the action sequence at Chicago. He was spotted wearing a black suit and helmet, riding a sports bike. Insiders reveal that Aamir is working hard for a flexible and toned body.