Slendertone Systems Female Abs is a great toning belt which is clinically proven to give results from 4 weeks. Use the belt 5 times per week for 4 weeks to achieve firmer, flatter and more toned abs. It enables you to work your complete abdominal musculature with its patented three pad placement design, positioned around the waist and across the belly button. This targets the rectus abdominus, Oblique muscles and activate transversus abdominus that is most effective in flattening your stomach. The muscles simultaneously contract and then relax, similar to the regular muscle contraction experienced during normal exercise like ab crunches.