I exercise at least three times a week and do core exercises on a stability ball every day but the midsection just isn't firming up as fast as I would like.
Are sit ups that much more effective than anything else???
Answer by tyfry7496 at 6:32 PM on Jun. 27, 2009
Answer by ormom1977 at 12:39 PM on Jun. 27, 2009
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