There's never been a better reason to exercise, at least for a few minutes a day. I'm not saying that to make you feel bad about yourself or your extreme commitment to staying inside and looking at stuff on the internet. In fact, that's what I call the good life. I'm telling you this because the Soccket, currently in its Kickstarter phase, is a soccer ball that "harnesses the kinetic energy of movement by turning a generator connected to a rechargeable battery." Currently, the Soccket is being distributed amongst resource-poor neighborhoods in the western hemisphere where sources of light and electricity are not readily available. Not to mention, think how useful this would be in case a zombie apocalypse, or basically any kind of apocalypse.
The Soccket on Kickstarter