Hope all have heard about power saving mechanisms from muscular movements of the body. For eg. it might be a nanogenerator or simplemechanism of saving energy from shock absorbers of a two wheeler. I did a paper recently on nanogenerator. there i faced a question like, where does the energy you are saving comes from? its all from your body only. So of course this will deteriorate the stamina and fitness of the person like that they posed. But according to me, only the energy which is wasted alone the nanogenerator is consuming.He said like if we go on consuming the energy those will be trapped off from yours only like that What the judge asked is totally contradictory for me. Can anyone help me clarifying this doubt? .