Click here for more details: br Slendertone Flexmax Women s System Abs Toning Beltbr br Flex Max is the most powerful Flex product ever with 10 toning programmes, including 2 ab crunch programmes. Guaranteed to strengthen and firm all abdominal muscles. User trials showed: 20-25 increase in abdominal muscle strength; 9 in 10 reported a firmer stomach; 8 in 10 reported a flatter stomach Flex Max reaches intensity levels of up to 130.