Seeing Hrithik's condition, his father and director Rakesh Roshan planned to shelve it.
"The hard work for 'Krrish' actually went into resurrecting my back because when 'Krrish' was about to start, I had a double slip disc. So it was all about recovering from that to be able to do the film," the 39-year-old said here Tuesday at the announcement of "Kid Krrish", an animation series inspired by "Krrish" franchise.
"Doctors had advised me against doing the film and my papa was also told that this would be very dangerous for him to do. Papa wanted to shelve the film," he added.
But the 39-year-old's determination made "Krrish 3" happens.
"But I was determined and I asked for three months. I was sure I would get strong again and I would be able to do the film. So physical training for the film was about recuperating from my bad back," Hrithik said.