Cycle to freedom
Full prisons, where prisoners only see the sun for 2 hours a day.. Not the ideal situation, but reality in Brazil.
As a solution the following initiative has been implemented: Bicycles which generate energy are free to be used by inmates. By cycling, inmates power the city's lightning, have a healthier lifestyle and reduce their sentence.
This way inmates do something good for society(powering street lightning), stay healthier by more exercise and breathing fresh air and, while staying in prison for a shorter time, leaving more space for the others, creating a win-win situation.