Describe in general terms a gamified system that could effectively motivate behaviour change to improve the health of city employees. Specifically, explain how the system would effectively incorporate intrinsic motivation, extrinsic motivation, or both. Your answer should address the fact that this is an internal gamification project, targeted at the institutional goals of the city government. The system can use any technology (or no technology!), so long as the resources required seem justified by the scope of the opportunity.