Breathing is a motion that never stops for long - unless you are dead of course. Put an elastic belt around your chest that has built in Piezo elements or some other generator in a suitable configuration and you make power from breathing, even in your sleep. It won't be a lot of power since you don't want nightmares about being strangled by a python, but it could probably keep a cell phone charged or run a heartbeat monitor, or other useful widgets. The device could also help to burn extra calories for those who need it.-- kbecker, Apr 07 2004 So your phone will always be fully charged, but you'll feel like you've got asthma?-- hippo, Apr 07 2024 I wonder whether this would lead to the development of more powerful muscles - possibly around the diaphragm.-- pertinax, Apr 07 2024 [pert] - I see, yes, this could be part of a training regime, like how elite cyclists train at altitude to force their cardiovascular systems to become more efficient-- hippo, Apr 07 2024 An electrical muscle stimulator would be better and safer for burning calories.-- Voice, Apr 07 2024 Hook up an electrical muscle stimulator to a muscle-powered generator.-- Voice, Apr 08 2024 random, halfbakery