Treadmills used to be a human-based source of power, and also a criminal punishment. I think that says enough about how much you’d need to pay people to do it all day every day.
You might be able to get an hour a day on an exercise bike out of someone without paying them for it. Call it 1MJ of energy. You know what else will generate ~1MJ of energy a day without asking to be paid? A $100 solar panel.
The bike itself would also cost more than a regular exercise bike.
You’re also not going to generate enough power to satisfy even a single person’s energy usage, you’d need a team of 20 people with several bikes just to air condition a house.
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