Found this linked in a German blog I wrote about [here](https://steemit.com/deutsch/@bossel/radelnder-umweltschutz-laut-don). They test whether you can toast a piece of bread by cycling. Or, as they write it:
"World famous track cyclist Robert Förstemann battles a 700w toaster. Can he, with his 74cm legs, generate enough energy to create a golden-brown toast?"

<iframe width="560" height="315" src="https://www.youtube.com/embed/S4O5voOCqAQ" frameborder="0" allow="autoplay; encrypted-media" allowfullscreen></iframe>

Makes me think twice about my idea to power some of my household's electricity this way. I would probably generate just enough energy to power my laptop for a few hours. I suppose, it's better to just go cycling outside & enjoy the environment.