Did you know that you could raise money for dozens of charities right now, for free?
Charity Miles is a great mobile application that displays some ads when you start a workout in the app.
By walking, running, or biking, you can use the revenue generated by these ads to donate to one of 45 different charities!
The program has raised more than $2,750,000. Click here for an (incomplete) list of charities that Charity Miles supports!