Just wrap a flexoelectric ribbon around your lung and harness your breathing
Future flexible lung belts could harness energy from the rhythm of your breathing, powering pacemakers or other implantable medical devices.
Nanotechnologists have found a way to integrate flexible piezoelectric materials with a stretchy silicone rubber, fashioning materials that can withstand lots of elastic strain while also harvesting energy from motion. Other piezoelectrics are not so elastic and can crack under pressure. Piezoelectrics, you’ll recall, turn kinetic energy into electrical energy.