Giving back has never been easier — or healthier. The people behind the new app Charity Miles will donate money (up to its already established sponsorship pool of $1 million) to a charity of your choice for every mile you walk, bike, or run. All you need to do is log in, select an organization, and start moving. The app tracks your distance and, when you finish, donates 10 cents for every mile you bike and 25 cents for every mile you walk or run. The kindness-promoting program then prompts you to share your accomplishments on social media, where friends and family can discover the cause — and start racking up their own do-good miles. Free for Android and iPhone from Google Play or the App Store.