Flex belt : fast complete core toning - mens blog talk, Flex belt: fast and complete core toning the flex belt® has achieved "legend" status in the fitness market with consumers because it consistently delivers flatter. Flex mini® -- firm tone butt - blog, The flex mini® delivers a more toned, firmer, and shapely butt through proven science. using advanced ems technology to focus on the entire butt and upper thighs. Contour abs . slendertone™ & flex belt | ab belt review, The flex belt does work. of course with most exercise equipment it will work different for different people. i ordered the flex ab belt didn’t really have any.