We all know the key to bodybuilding, especially competitive bodybuilding, is to make progress and to continually improve. The emphasis being on the word "building." So, how do we do that? The answer is basic, or compound movements. Movements that work more than one major muscle group at a time plus several assisting muscle groups. The result being a greater overload on more muscles in a shorter workout, thereby creating a greater growth potential.
Basics seem like an old principle, but it keeps coming up because it works. Though it's especially important for taller bodybuilders and super-heavyweights, it's still applicable to everyone. But heavyweights and super-heavyweights tend to have a larger frame to fill in to be able to look thick. Thickness is what separates weightlifters from all other athletes. Besides, the thicker you are, the greater the potential to create deep mature muscle separation with your isolation exercises later.
Generally speaking, the better you hit a muscle during a workout, the more recovery time you need. As we go through these exercises, you'll notice each bodypart is hit about once each week. Not only are the basic exercises more taxing on your recovery system, but they should be done heavily, or at least moderately heavy, to build the most strength in the muscles and the connective tissue. That further increases recovery time, but it also increases exercise effectiveness and muscle size.