Work until I found his Slendertone GymBody Plus belt. It has two programmes; program 1 for beginners and program 2 for more experienced users. The instructions state to use program 1 for 2-4 weeks to build up your ab muscles then program 2 to really...
Comfortable, self adjustable workout intensity, cheap, lightweight, easy to use, actually works
None really, pads may wear out but are cheap to replace