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7 Weeks to 300 Sit-Ups: Strengthen and Sculpt Your Abs, Back, Core and Obliques by Training to Do 300 Consecutive Sit-Ups: Stewart, Brett: 8601405180520: Amazon.com: Books
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Answering the Question- How Many Sit-Ups Should I do a Day? - Fitness Baddies
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What is a good way to get used to doing sit-ups and press-ups? - Quora
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