Enjoy firmer and stronger ab muscles after just six weeks with the Slendertone Flex Pro abdominal training system. Designed exclusively for men (an alternate version is available for women), the Flex Pro doesn't require thousands of sit-ups or crunches to tone your abs.  Instead, the system employs medical-grade Electrical Muscle Stimulation (EMS) technology to simultaneously work all of your abdominal muscles while you walk to the store or sit in an office chair. Simply strap on the toning belt and adhere the included gel pads to your skin. The belt will then send signals to your nerves by way of the gel pads, causing the muscles to relax and contract for an effective yet comfortable abdominal workout. The system has been clinically proven to firm and tone all three abdominal muscles--the rectus, oblique, and transversus abdominis--in addition to boosting core strength and improving endurance.