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Hook a bicycle rim via fanbelt to a generator or small permanent magnet motor.. It may be enough to power a small lightbulb. The fact is you will burn more calories and energy than you can produce.in return voltage.

the best thing i saw was the exercise bike hooked to a generator/transformer to charge a deep cycle battery. the kids had to do this to power the tv. they made the youngest do all of the work. dad caught 'em doing that, and made the oldest do the work. some types of punkin chunkin machines use pedal power to charge giant springs or weights to power the chunkers.

Friction

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