[lumiukko]

Here's a source for that. I also remembered it.

https://www.scientificamerican.com/article/a-human-on-a-bicy...

[pandaman]

Did you read it? Humans aren’t very efficient movers—until you put us on a bicycle, when we become some of the most energy-efficient land travelers in the animal kingdom. right at the start. It talks about animals only.