Crunch machine : How to do this exercise for abs ?

Crunch machine : How to do this exercise for abs ?

Abdominal Crunch Machine - Abs Exercise Guide with Photos

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PERFECT WORKOUT EQUIPMENT:The AB Machine's hyperbolic rails perfectly mimic the natural curvature of the spine, causing no stress or strain on the

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You Honestly Never Have to Do Crunches Again, According to Science

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