I vary exercises each month to produce muscle shock and keep making gains. The only consistent thing is I starting training legs 2 days a week, becuase they just were not growing. I have already started to see good progress and sometimes use occulsion training to my legs at the end of the workouts to really get the blood flowing before I force feed my mucles with nutrients/food.

I usually perform workouts similar to layne norton. In that I like the powerlifting/hypertrophy approach and not just one or the other. So one month I will concentrate on a certain muscle group that looks weak, but do one workout of powerlifting routines, and one workout of hypertrophy routines in the week. So tendon/lig. strength vs. blood flow/pump, for each of the muscle groups, if say my chest and shoulders look fine, I put them on one day, and train them together, with a mixed power and hypertrophy in one workout method to say myself time in the week, but still main strength and fullness in the muscles.

As far as a program I pull from varies exercises that change from month to month. Never do, eat, or repeat the same thing to often, becuase your muscles will get used to it, or your body in the case of food/dieting.