If you wanted to generate an equivalent amount of energy, you'd have to be pedalling a bicycle with a mass of 1 ton or thereabouts, and the hard part is slowing down at all the stop signs and accelerating up again. On the plus side, if you did this regularly, you would have excellent prospects at the Tour de France ;) -- $E(X_t|F_s) = X_s,\quad t > s$
