Renew Year: Day Fifteen

If you missed it, read the down-low on what Greatist's Renew Year Challenge is all about.

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This is the best news ever: Volunteering is good for your health. So get out there and lend a hand, or find a kickass organization to donate to.

Not sure where to start? Here are 13 social good apps for a better you (and world). Or, if you're the sporty type, get involved with one of these 20 sports organizations that are giving back.

You're awesome. Tell the world about it.