The 31-year-old actress plays the female lead in the action thriller, which is the official remake of the Hollywood film ‘Knight and Day’ starring Tom Cruise and Cameron Diaz.
Kaif told PTI: “Dancing with Hrithik was the biggest challenge. His flexibility is incredible. It is at a different level altogether. You have to be really good to match up to his energy.
“He has natural energy when he dances. It comes to him so effortlessly.
“I was okay during rehearsals because Hrithik was not dancing! Finally when we danced on the sets, we all know who danced better.”
Roshan praised director Siddharth Raj Anand, adding that he is happy he chose to star in the film.
“Normally I want to know every aspect in a film before saying yes. But this time I didn’t. This is the first film in my life which surprised me. This film truly belongs to one man – Sid. Everything he has done in this film is simply amazing.
“Bang Bang is one of my best films. I just saw the final rushes of the film and I am very happy.”
The movie, which also stars Danny Denzongpa and Jaaved Jaffrey, will feature Hollywood-produced special effects.
Bang Bang releases on October 2.