Does anyone have any advice about the best way to set up a demonstration of how muscle tissue can be stimulated by electricity? Specificly how frest does the tissue have to be? Is material you can buy at a good butcher shop likely to be fresh enough and how long will it last? From what I've read so far I get the impression that white meat is better than red and heart tissue is quite good for this demonstration but I really want to demonstrate a muscle contraction capable of doing some piece of physical work. I also get the impression that AC current is best but I'm not sure what voltage to use. I suppose it's an excuse to play with my variac.