Firm your deep ab muscles to shrink your waist, improve your posture. Do this circuit twice, three days a week, for serious results.

Firm your deep ab muscles to shrink your waist, improve your posture. Do this circuit twice, three days a week, for serious results. Source: http://www.fitnessmagazine.com/workout/abs/exercises/power-abs-workout/?page=1&crlt.pid=camp.QoNdUdg2Gw4A

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