To manage your muscle mass and body fat percentage you first have to understand your measurements. Often people mistake building muscle mass with burning body fat. These two often go hand in hand, but they are not the same. Muscle mass includes the weight of the muscles in your body in kilograms or pounds. While the body fat percentage measures the amount of fat your body holds. Burning body fat can be a result of the accumulated muscles. Muscles are like engines when it comes to consuming energy. Our muscle mass plays a crucial role when it comes to fitness. When your body builds muscles, it burns energy and fat all the time.