Mobile application for physical activity monitoring and promotion

We require am Android mobile application that uses Google Fit to monitor physical activity of users, and promotes physical activity by having individuals and groups compete for virtual trophies and real-life prizes. The application should have daily goals for individuals, weekly goals for individuals and groups, and monthly competitions for individuals and groups. Each of these can use different variables to compare the competitors (e.g., steps or heart points). The application also needs group/user management, and notifications about progress and prizes. A backend database is required to store user activity data, and a web application to manage goals, competitions and notifications.