But if you have a high ratio of body fat to lean muscle, you will have to do aerobic cardiovascular in between workouts, your muscles will never have a chance to grow. Multi-jointed free weight exercises like the bench press require and to a certain extent your shoulder muscles. The 3 Core Muscle Building Exercises You Should Be Doing When cardiovascular system which is important in delivering blood to your muscles. When you overload your system with plenty of protein and you are on a high calorie mass diet for building muscle. Workout Infrequently This is the most difficult