Prisoners in Brazil ride bikes to generate power.
In Brazil, they've found a novel way to generate "alternative" energy:
'Since the oil shocks of the â??70s, Brazil has been home to a carnival of renewable energy initiatives that now generate a whopping 85 percent of the countryâ??s power. At Santa Rita do Sapucaà prison, inmates are contributing to the effort by riding stationary bikes which charge batteries that fuel lights at a nearby park that previously didnâ??t have electricity. That makes the park safer and shaves a little off the cityâ??s carbon footprint, while giving the inmates a chance to get buff â?? and reduce their sentences.'