CHARITY MILES: THE BEST APP FOR IMPROVING THE WORLD WHILE LOSING WEIGHT
Most other apps on this page emphasize tracking, but Charity Miles is all about motivation. For every mile you walk or run during a range of preset workouts, it shoots off a small donation to your choice of 42 different charities—and well, that’s it, really. If you wish, you can also participate in teams. The charities include everything from the ASPCA to The Nature Conservancy, but you’ll never have to pay a dime.