Influence a cool fitness app

I assume it provides calories burnt is there way it can predict how soon user will loose the extra fat given the exercise schedule ? is there a way to create list of user's Facebook friend who are using this App and provide how they are performing ?

Sounds promising! Is the app going to be available for other platforms such as Android, BB and Samsung's Bada ? If yes, then how soon ?

How does this compare with the a number of fitness apps in the app store?

Can I barter the movie ticket with a specific fitness tip?