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How do I use my ab workout chair, and how long would it usually take to get bigger abdominal muscles?

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i got this ab workout chair, it looks exactly like this: http://funadvice.com/r/15tbj8roq6f i wasnt sure how to use it, but i went all the way back and pulled my legs and upper body up with my stomach for three sets of thirty and i did all of them, but im not sure if im doing it right, could someone help me with this? and if i am doing it right, how long would it take to see results?