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@barber
I didnt watch the program.
However the maths sounds seriously Iffy,
I mean, what about the fact that you have to fuel the people with More Kj of energy than they would be able to produce from the cycling, and with all of the other losses ontop, this would be unbearably inefficient.
Energy don't come from nowhere.
In Fact, you could burn the food directly, to produce more energy than the bicycles. This way you cut out the middle man, literally.