Gemini Man most demanding film of my career: Will Smith

Los Angeles: Will Smith, who will be fighting his younger self in Oscar-winner Ang Lee's Gemini Man, recently said the "emotional and physical challenges" of making the film have been the most demanding of his career.

It is for the first time that Smith, known for his action-comedy roles in Hollywood has teamed up with Lee, one of the most genre-bending directors in the modern era.

Billed as an innovative action-thriller, the Paramount Pictures film will see Smith as Henry Brogan, an elite assassin, who is suddenly targeted and pursued by a mysterious young operative that seemingly can predict his every move.

The trailer of the film, which dropped on Tuesday, shows jaw-dropping action scenes peppered with suspense and a de-aged Smith.

The filmmaker and actor of Hollywood, Smith, who aged in reverse with the help of digital technology to play his 23-year-old version, called Lee's direction "cinematic wizardry".

"Ang is pushing the limits to give people an experience in the movie theatre that you can't get anywhere else. This is not only an action film, but an exploration of what one's younger self can ultimately teach one's older self. I'm 50-years-old now, and the irony of becoming 23-year-old Junior in this film is that 23-year-old me wouldn't have been ready for this experience or to take on this role," he said.