Seeing Hrithik's condition, his father and director Rakesh Roshan had 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.
"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.
Releasing on November 4, Krrish 3 is a superhero flick and it is third in the franchise. It also stars Priyanka Chopra in the female lead.
However, 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.
If that was not enough, he recently had a brain injury on the sets of Bang Bang and had to undergo a minor surgery, which led to a delay in the shoot of Bang Bang.