I was always told that heating with a wood stove warmed you when you cut the wood, when you split the wood, when you carried the wood in, and finally when you burned it. I can remember my grandmother pitching a hissy fit when they took out her wood cook stove and put in a gas one. Took her a good three months to quit fussing about it. But, Lord, could that old woman cook a meal on that wood stove!!
[MENTION=127308]TromboneAl[/MENTION]: A scifi writer, Dean Ing, put just such a scenario in one of his novels. The bike used one of those generators that is turned by the tire and was used to charge a 12-volt car battery. I don't remember the exact figures, but it was something like four hours of steady pedaling would charge the battery enough to allow the use of a low-watt twelve-volt bulb for light for an extended period of time. The novel (name escapes me) was written some years ago when bike generators mounted to the fork or the frame and was pushed against the sidewall of the tire. Remember those?