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I don't think gp is suggesting using people to generate electricity through exercise. Finding a way to harness energy released when lots of people are exercisi

I don't think gp is suggesting using people to generate electricity through exercise. Finding a way to harness energy released when lots of people are exercising anyway (i.e. at a gym) might generate an appreciable amount of energy, with no change in human behavior.

Someone 15y ago
An ancient way of doing that was to have living quarters near or on top of cattle stables. That way, the body heat of your cows would heat your living quarters in winter. A quick Google shows that there are modern ways of doing this: http://www.telegraph.co.uk/news/worldnews/europe/austria/1448761/Farmers-use-cows-milk-for-under-floor-heating.html http://www.telegraph.co.uk/news/worldnews/europe/austria/144... There also have been proposals to use the excess heat and manure of pigs to grow mushrooms.