Thats something i didnt understand as a child. Why not create power with sport?
In times of WoW Gold Mining Farmers i wonder when the first electricity farms appear where poor working slaves have to create power...
Being human power I guess you could say, the only free lunch would be a free lunch.
You refer to the meals needed to create power? Otherwise i dont have a clue...
I only thought there are poor chinese that work all day at websites like captchabot to solve captchas for spamsoftware like xrumer and similar. They earn nearly nothing with it. I wouldnt be surprised if someone "invents" a human hamster wheel at some point...