Where Was This Ad Posted?

I have an English assignment and I need to post a visual argument. I found an ad on google from you that I absolutely love. (It's yellow, ther are 3 words in black on the page that say fat fat fit where the letter a in the words fat is an image of a fat, maybe obese guy, and the letter I in the word fit is an image of the same guy except this time he's skinny and in shape. on the bottom of the add it says gold's gym). I reallly like this ad, I think it's fantastic and really creative. it says it all and I would love to use this ad for my argument and therefor was wondering if someone can tell me where this ad appeared (in what magazine, news letter and so on) as I want to trace it and give credit where credit is due? The ad is attached.