Mr. Prefectionist Aamir Khan, who is playing villain in 'Dhoom 3' will be performing some gymnastic events in the film.
Aamir, who is busy in the shooting of 'Dhoom 3' in Chicago, was delivered on the trapeze and acts in flight of a song in the film.
"He was delivered on the trapeze and acts in full flight for the shoot. The place has been reserved for good long 40 days," said a source.
The star, always experiment with his looks in the movies, will appear in a lean body structure in 'Dhoom 3'.
"Aamir is pumping iron around the sets. He wants to be fit as a fiddle," the source told reporters.
Written and directed by Vijay Krishna Acharya, 'Dhoom 3' is the third installment in the popular Dhoom series.
The shooting of the film is underway in Chicago and Aamir Khan fans have seen often riding black BMW R 1200 superbike.
Abhishek Bachchan and Uday Chopra will continue to reprise their roles as Jai and Ali, respectively, while Aamir will be seen in a negative tone, opposite Katrina Kaif.
Produced by Aditya Chopra, "Dhoom 3" is scheduled for release in 2013.