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The 6 second abs has been around for a few years and looks to be one of those rare fad items which actually stays the course. It is a relatively simple machine with elastic cords which can be swapped to provide greater resistance and a unique '3 click system' to help you keep the right posture and work at the optimum speed.
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As they say themselves, it is not 'rocket science' but it makes sure you are correctly aligned and working the right muscles at the right speed, and provides a neat way of varying the resistance. It is said to be up to 15 times more effective than doing situps using gravity resistance alone.
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