"As far as physique is concerned, you have to be active. You can't let it go for such a movie. A lot of flexibility is required in this film ('Main Tera Hero'). All the stunts and action scenes in the film will be comical, but for that one needs to be very agile," Varun told reporters here Monday at the launch of a fitness DVD.
"I have concentrated more on my flexibility in this film," added the young actor, who made his Bollywood debut with "Student of The Year" (SOTY).
Varun is focussed about his work, and says even comedy requires some alertness.
"It is good as it is comedy, but we have to remain alert and bright. We get time to do masti (fun), but that we have to (also) do in scenes," Varun said.
Any pressures about working under your father's direction?
"I am not looking at it that way. It is just a film for me. This movie went on floors after one year (after 'SOTY'), so till then huge preparation had been done and all the pressure I had that - 'Oh god I have to work with my dad!'...I think I got over that till the time the film started," he said.
David is strict on the set.
"He had even scolded me two to three times and then I realised he is the director and I am an actor. So I have to perform, otherwise he will not be happy," he added.