I'm learning how to make android apps and thought of a running app that I would like to be created.

Basically, it matches you up with other racers online and you can challenge them to a race. The app would indicate when the race starts, show you the progress of others in real time, and allow others to cheer you on. It would require your phone to have GPS and mobile data/indoor wifi.

There would be an option to post a challenge (with race options) that others can accept. Or you can view a list of challenges by other users and choose which one to accept.

Perhaps have several running events every day (e.g. 5k) so people can race at home.

That's the basic premise of it. Thoughts?