As a That's Fit reader, you might consider yourself fairly knowledgeable about health and fitness. If so, head on over to Oprah's website and see how you perform on the first-ever Dr. Oz's Health Quiz.

You'll learn the healthiest shape of your poop (provided you're a looker), how many days a year you should be having sex for optimal health, and what causes that painful brain freeze when you're sucking down a blended smoothie with fresh fruit, fiber and whey protein -- not a milkshake, right?

Sixteen quick questions only require a couple minutes. I answered 11 out of 16 questions correctly -- thought I'd do better. How about you?

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