From Jeff Willet (Max-OT trainer):
Day 1 ? Chest, Shoulders & Triceps
Flat Bench Press?.3 sets 4-6 reps
Incline Bench Press?.3 sets 4-6 reps
Dumbbell Presses?.3 sets 4-6 reps
Side Lateral Raises?.2 sets 4-6 reps
Tricep Cable Pushdowns?.2 sets 4-6 reps
Dumbbell Overhead Extensions?.2 sets 4-6 reps
Day 2 ? Back, Biceps & Abs
Deadlifts?.3 sets 4-6 reps
Lat Pulldowns?.3 sets 4-6 reps
Bicep Barbell Curls?.2 sets 4-6 reps
Dumbbell Curls?.2 sets 4-6 reps
Ab Rope Crunches?.3 sets 8-12 reps
Swiss Ball Crunches?.2 sets 8-12 reps
Day 3 ? Legs & Calves
Squats?.3 sets 4-6 reps
Leg Press?.2 sets 4-6 reps
Stiff Leg Deadlifts?2 sets 4-6 reps
Seated Calf Raises?. 2 sets 6-8 reps
Calf Raises On Leg Press?.2 sets 6-8 reps
While this setup will work, I really recommend using the 4 or 5 day splits as they allow for way more focus. After about 6-8 sets of lifting in that rep range it becomes tough to get in “the zone” and prepare to go to war with the weights. Not to mention the total number of working sets for some body parts drops to 1 or 2 for the entire week, and some things get dropped entirely (Traps, Forearms - which I really am looking to grow). Obviously you can sneak them in somewhere, but these workouts are already pretty damn crowded and the intensity will be waning towards the end of them.
Also, if staying lean is a priority (and you are the type of person who needs at least some cardio to stay lean) it becomes difficult to add cardio into these sessions, going 5 days a week shortens the length of each session considerably so you can easily add 15-20 minutes and not be knocking on 90-120 minutes in the gym at a time.
Keep the Questions coming if you have them.