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See http://www.workoutbox.com for more workouts and exercises.
The reverse twisting crunch exercise is another great addition to a solid core exercise routine. This particular movement targets mainly the obliques and lower rectus abdominus muscles and is one of the best crunch exercises. While it might not look like much, you might be surprised how useful it can be. Be sure to focus on contracting your obliques as you bring your knee to your chest.
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