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The jackknife sit-up technique is a really great way to give your obliques a good workout. Find out how to do the jackknife sit-up technique for obliques with help from one of New York's hottest fitness experts in this free video clip.

Expert: Jacques Laventure
Filmmaker: Rafael Rodriguez

Series Description: There really is no excuse for not adopting a well-planned and properly-utilized health and fitness routine - it is a lot easier than you might think. Get tips on health and fitness topics with help from one of New York's hottest fitness experts in this free video series.

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