In its current form KeepOn is just a first prototype which demonstrates one way of how challenges can be combined with sports. Future work includes extending the current game to incorporate a multiplayer version where you and your friends can work on challenges together, and also more challenge types (e.g. average speed, time required, days spent, etc.).
The reason we are releasing a prototype this early is get as much feedback from you of what works and what doesn't, and ideally what a future version of KeepOn should look like. So please don't hesitate drop us a note, we appreciate all kind of feedback.
KeepOn is completely free and open source, available at GitHub: https://github.com/FauDroids/KeepOn
This app is part of the Android Challenge where we (a small group of passionate students who love android) are building one Android app every month in 2015. KeepOn is our app for July. If you want to know more head over to our website at http://faudroids.org and make sure to leave a comment with your thoughts.