Your friends run to save the whales/cure cancer/stop global warming, and of course you always donate to their worthy causes. But if you?ve ever wished you, too, could exercise for charity without, you know, joining an official association, we?ve got good news: Charity Miles.

This new iPhone and Android app lets you earn cold hard cash for one of many global nonprofits while you run, walk or bike, all courtesy of a $1 million purse from corporate sponsors like eBoots, Promax Nutrition and the United Nations Foundation. (Bikers earn 10 cents a mile, while walkers and runners earn 25 cents a mile.)

To get started, create an account and choose your preferred method of exercise. Then select from a long list of top-tier charities--think Stand Up To Cancer, Feeding America, The Michael J. Fox Foundation and Habitat for Humanity.

Every time you do said activity, the program will track your miles and donate accordingly to your chosen organization. It will also track your time, distance and the impact you've made, so you can chart your progress and contributions.

Getting fit while fixing the world? Sounds like a noble endeavor to us.

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