Pedal Power

https://solar.lowtechmagazine.com/2011/05/pedal-powered-farms-and-factories.html

Charge your batteries with Pedal Power
https://www.youtube.com/watch?v=cWk7TgxKpo0

Building a Bike Generator
https://www.youtube.com/watch?v=tQBWECQCFcQ

https://www.popularmechanics.com/technology/gadgets/how-to/a10245/pedal-power-how-to-build-a-bike-generator-16627209/

Bike powered electricity generators are not sustainable
https://solar.lowtechmagazine.com/2011/05/bike-powered-electricity-generators.html