Exercise Games - PS3?

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HEY there!
I was wondering if anyone here uses fitness games on the PS3?

I've been hunting for the Playstation Move and I noticed some fitness games for it - I was wondering how good are they? I'm tempted by Mel B's Fitness exercise and a couple of others I have seen like Zumba.

Would you guys recommend? Do you know what I need? Would the camera + controller be enough?Do I need the navigator? Are they good? Any recommendations?

Thank you! :D