Will Smith thinks being physically fit is the key to happiness.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 L...

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