Slendertone flex is a clinically proven easy to use abdominal muscle toner in independent clinical trials 100 of users reported firmer more toned abs an average of 14inch waist reduction was measured and 3 times more effective than its nearest competitor slendertones patented technology mimics the bodys natural muscle movement signals are sent to activate the nerves delivering a complete abdominal workout to the rectus oblique and traverous abdominus muscles this ems technology is