Hrithik, 40, underwent a brain surgery to remove the two-month-old clot he developed after the injury.
"We all go through challenges but I always enjoy them. If you have clarity of thoughts, you will realise that nothing lasts forever. Put your best foot forward and just keep moving ahead. Don't assume that things will go wrong. The day I stopped assuming the worst the best started happening," he said while launching the title track of the movie.
"There are a few things I have discovered in the journey of this film. I lock myself inside a room while preparing for the film. I did not need to do that with this film. I have done zero preparations for this film. It was an incredible experience. In a way this was one of the easiest films I have done," Hrithik said.
Bang Bang's teaser received maximum likes on Youtube and Hrithik revealed that his sons -- Hridhaan and Hrehaan -- are admired his look in the thriller.
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The fitness freak, who will be sporting eight-pack abs for the film, is also planning to pen a book on health for his fans.
"I truly feel a responsibility to contribute back to the millions of people who don't have the resources and the education. But they have the desire. I want to educate them with the tools and education I have to help them achieve their dreams," he said.