Whats the difference between the way you work out, and the HEAVY DUTY type of work out?
Heavy Duty advocates just One or Two sets per bodypart. The fact that you are only doing one or two sets limits your ability to incorporate many different exercises that would work the different areas of each bodypart. If you are training Shoulders you would want to incorporate exercises that would work the entire deltoid area. This means the Anterior Deltoid (Front), Lateral Deltoid (Side), Posterior Deltoid (Rear) and the upper traps. It would be impossible to work all of these areas with a 2 or 3 set program for Shoulders. If you want great shape you must work the muscle from all angles as well as train the muscle till failure.