Many personal trainers have clients who are hesitant to pump iron while they're trying to lose weight because they're afraid that they'll actually gain. Nowadays, although we understand that it is body composition, not body-weight, that tells the story, most people still go by the
scale when measuring the success or failure of a weight-loss program.
Research continues to document the benefits of resistance training as an adjunct to weight-loss programs. The two main advantages include the calories burned during the exercise and the elevated metabolism that gains in muscle mass bring. Restricting calories alone generally leads
to losses of lean body mass, or muscle, as well as bodyfat, while the combination of a diet and aerobic exercise helps to limit the muscle losses that come from dieting. If you add weight training to the mix, however, you may actually gain in lean body mass, which will result in
a faster-burning metabolism.
Since muscle is metabolically more active than fat, it requires significantly more energy per day for upkeep. This translates to the fact that the more muscle you have, the higher your metabolism is and the more calories you burn even before you start exercising. In fact, estimates
of calorie requirements for muscle range from 30 to 50 per pound of muscle per day.
So even if your goal is weight loss, you're better off focusing on lean weight and fat weight rather than overall bodyweight, and if you incorporate resistance training into your weight-loss program, you'll help keep your metabolism up and your calorie balance negative.