This 17 minute ab workout is very controlled and deliberate. Breathing is very important when it comes to working the abdominals. Try to over exaggerate your breathing with this routine to really contract the diaphragm and squeeze the abdominal muscles. So you should be crunching at that exhale when the abs are at their tightest to get that deep contraction. These moves combined with cardio and a proper diet will help you see definition in your abs.
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