If you do, you will know how hard it is to find the conducting gel that you need to make them work properly. Water alone is not good enough.
A UK based company has developed a range of conducting gels just for EMS use.
Visit www.toningpadgel.co.uk for full details.
Why would you want use this sort of machine anyway??? Do it the old fashioned way and do Ab crunches and good old Cardio, most of all diet, and watch what you eat.