I think I remember something like that, the bicycle people. It wouldn't be that hard to calculate the energy, websites where you buy windmills usually have charts showing KwH produced at different wind speeds. A person would probably create the force of a 7 mph wind for about an hour. That gets them fuckers spinning pretty good, but it has to be sustained. One chart showed four of those curly lightbulbs for the day (which a family would use between 4-6 hours, not a whole day) at its lowest collection point. Thats a lot of effort for not much return, which is why people tried capturing wind as soon as they could think straight, 5000 years ago. They used it for moving water uphill, to grind grain, and to move boats obviously. Much more efficient than people, even if they were slaves.
The problem with wind generators is they don't spin freely. They create resistance when generating. So you can have mild wind with your windmill standing still, even though it would flap a flag or pull a kite. Same thing happens with hydro if you don't have adequate head pressure. The water just drizzles over the wheel and the wheel doesn't move. So with people involved, they'd be working out against some considerable resistance. I guess it wouldn't matter, though. With human power being spent, it can be measured in Newtons, so a guy pumping weights would exert measurable force just like the lady doing cardio, and you'd just design the dynamo accordingly.
My manservant will not be pleased when he learns of this new development in the Brasky Project.
The taxes on marina space are removed enough for my liking, indirect. If they choose to report their income is none of my concern. You can possibly find private slippage in a waterway. Pictured below is all private, its peoples back yards. There are hundreds of these canals in Florida, and all coastal states.