Bicycle-sharing systems have been shown to have a strong net positive health effect. Cycling is a good way for exercise and stress relief. It can increase recreation and improve sociability of a city, which make people live more happy and relaxed. The report from Centers for Disease Control and Prevention (CDC) point out that cycling also help preventing disease like obesity, heart disease (can reduce up to 82%) and diabetes (can reduce up to 58%). Therefore, bicycle-sharing systems has a positive effect on mental and physical health, which attract more people to use. (Demand increase)