Dwayne 'The Rock' Johnson says spending time with amputees in preparation for his starring role in 'Skyscraper' was "one of the most unforgettable experiences" of his career.

The 46-year-old action star plays the part of a former FBI Hostage Rescue Team leader and amputee in the new movie, and Dwayne has admitted that his preparation for the film was one of the most memorable experiences of his time in Hollywood.

Speaking to the South China Morning Post newspaper, Dwayne shared: "It was an opportunity to play a character that was quite different from what I played in the past. I spent some time with amputees. It was very informative. It was one of the most unforgettable experiences."

Meanwhile, Dwayne recently warned moviegoers that 'Skyscraper' will send heart rates soaring.