I bought for the ab circle pro started, which in addition to not give me the impression of working the abs, hurt my knees! The 5 mintute shaper rapidly heat the muscles, the more you can adjust the height of the apparatus of our level. The lowest level is relatively easy and accessible to all! For the results I have not enough back, but I does me no worries! Working my abs more than in the floor exercises. The +: I can slide it under the bed when I did not serve me I RECOMMENDS YOU!