Aug 24, 2008, 8:00 GMT
Will Smith thinks being physically fit is the key to happiness.
US actor and cast member Will Smith reacts on stage during the premiere of the film 'Hancock' in Tokyo, Japan, 21 August 2008. The movie by US director Peter Berg tells the story of reckless superhero John Hancock (Smith) and will open in Japanese theatres on 30 August 2008. EPA/DAI KUROKAWA
The actor - who had to get in great shape for a number of film roles, including 'I Am Legend' and 'Ali' - thinks a healthy body equals a healthy mind.
He said: "I feel like everything in my life depends on physical conditioning. I love eating sweets and everything, but I think the quality of my parenting, the quality of my relationship with my wife - it is all based on being on great physical condition.
"I believe it's the beginning of finding true happiness."
Meanwhile, Will is to star in a prequel to 'I Am Legend'.
Director Francis Lawrence has confirmed the 'Men in Black' actor will reprise his role as Robert Neville - though he admits they haven't yet worked out a plot yet.
Francis said: "Absolutely, we're actually trying to crack a second movie. We're trying to figure out some ideas for it, but yes, it would be a prequel."
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