Gaining weight is obviously necessary for the body. However, you need to understand certain things. Your body may weigh much. That never means that your body has the perfect weight. Such body weight is of no use if the body is filled with fat. What is meant by weight is the mass that you have in your body. Muscle Weight Gain training will make your body fatless. Once your body is devoid of fat, you start gaining muscles, if you continue with your training sessions and weight gain.