You may have been told that cardio is the ultimate fat burner, but that effect stops the minute you hop off the treadmill. Build more muscle and you'll keep your body burning fat all day long. According to one study, adding just two sessions per week of heavy lifting can reduce your body fat by three percent without cutting calories.
Another study from the University of Alabama in Birmingham showed that dieters who lifted heavy weights lost the same amount of weight as dieters who did just card, but all the weight lost by the weight lifters was primarily fat while the cardio queens lost a lot of muscle along with some fat. And more muscle, less fat translated to smaller clothing sizes than their less muscular counterparts.