Electronic AB blet

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So I need to know if anyone has used one of these? and if they work? I can not do a lot of exercise due to my back and I was just told by my soon to be surgeon I have to be very careful what activities I do. However I was more toned and now my belly is starting to... um .... well ....bust out! So I am trying to get some insight on this and yes doing core exercises can be difficult for me to do too. Please and Thank You for your thoughts.