Physical fitness vs. Physical activity?

I have to find an article on physical fitness vs. physical activity. I tried using google, but keep coming up with dead ends. Does anyone know where to find an article like this?
Update: Yes, I am using Google right. I know how to search. I even know how to search just for those words, so this is not the issue.
Update 2: Daisy,

Thanks for the help. I tried everything from and, or, and finally tried compare and came up with a wonderful article. Thanks for the help...now on to critique the article...
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