i usually just stick with the simple idea of doing more sets for the bigger and more complex excercises (bench, squats, deadlifts, rows) than i do for the more isolated excercises. basically, i do around 4 sets for the big stuff, and 3 for everything else, but i consider the extra sets i perform with the big stuff my warm-up sets.

is there any difference between what i'm doing compared to what other people do by dividing up "warm-up sets" with "work sets"? i really don't understand this method very well, so if someone could help me out i'd really appreciate it.
spanx!

i usually do just one warmup set per bodypart. Just gets it losened up and ready for those next 4 or 5 heavy sets.