Tummy Tuck program
They used one of those muscle stimulating machines on the muscle above my knee because my knee was so bad after a knee surgery that I had lost all of my muscle tone and the kneecap was not being held in the correct position. My knees were not strong enough to exercise, so they used the TENS machine to build up the muscle. It worked very well. Soooooo...I would think that it could work to build abdominal muscles, but you would have to be sure it was a good machine. TENS machines don't cost all that much, so you could use one of those to get the same (or better results). Just my opinion, of course...