Lower Ab workout

I am considering in purchasing lower ab workout after i saw the right equipment in the tv the other day. I gained 12 lbs in the winter and thi equipment is something i needed to be able to get trim while being at home. Summer is inching closer and there would be a lot of gatherings including the swimming parties. Also some of the clothes in my closet right now are too uncomfortable for my size. I need to get back to where i was.