Adding resistance training to your weight loss efforts is very beneficial, both for your weight loss and for your health. You can add muscle, and keep your metabolic high. Maintaining a good metabolic rate is important in weight loss, because when people lose weight, typically their metabolic rate goes down, and then they have difficulty losing more weight. Strength training prevents muscle loss when on a low-calorie diet, and can even add muscle while dieting. Greater muscular strength means lower risk of obesity.