Finally—an excuse to slow down! When it comes to walking, 3.1 miles per hour (that's about a 19-minute mile) is the pace at which youll burn the most fat if you have 10 or more pounds to lose, according to a study in the Journal of Sports Science and Medicine. Instead of a jog, go for a brisk walk the next time you head outdoors.

Still feel like you were born to run? Check out our Girls Gotta Move running club for advice, race training schedules, and events near you.