Has anyone ever tried EMS to keep their muscles in shape when unable to exercise?? Does it cause a lactic acid build up and relapse as if we were to exercise? I bought a Slendertone belt to try around my waist since my back muscles have become so weak and would like to strengthen my core muscles. I also have the sensors to wear on any muscles and I was going to try it on my calf muscles since they have atrophied a lot in the last few years. I don't want to make myself worse but thought that maybe it could be beneficial since the heart rate doesn't go up and I can use it laying down. Any ideas?