WNT I have been thinking that forever and have been posting that on the site almost forever.
On a side note that is the name of the Scifi book I wrote: On the edge of forever about nano tech and virtual nano wires…
https://www.quora.com/How-many-horsepower-do-humans-have
Has some excellent answers that clearly demonstrate efficiency can be reverse calculated from purely “human” powered windsurfers, kiteboards and so on demonstrate.