Originally Posted by echobeach
When I was training for serious powerlifting the 3 lifts were always the framework around which we added other supporting movements so as to provide proper stimulation for the ancillary muscle groups.
But when it comes to bulking up - for sure lifting heavy in the 3 basic lifts will always help to add overall bulk - and usually the biggest gains will be in the first 18 months or so.
One thing to remember is that for any individual, the maximum amount of force any given muscle can produce is a direct function of its cross sectional area. Simply put - a muscle's 'strength' is governed by its size; so the stronger you get, the bigger you will grow.