Monday: legs n chest
Tuesday: shoulders n arms (arms day includes biceps,triceps and forearms)
Wednesday: chest n back
Thursday: legs and arms:
Friday: chest n back
Saturday: shoulders n arms

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Chest exercises:

Flat bench
Incline bench
Flies
Db pullovers

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Back exercises:

Pull ups
Pendlay rows
Lat pull down
Seated rows
Back extensions

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Shoulder exercises:

Military press
Lateral raises (cable optional)
Rear delt raises (face pulls optional)
Front raises
Shrugs

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Leg exercises:

Squats
Leg press
Leg extensions
Lunges

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Bicep exercises: 3 exercises from the following

Barbell curl standing (preacher curl)
Seated incline curl
Isolation curls
Rope hammer curls

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Tricep exercises: 3 exercises from the following

Tricep extensions db
Cable push downs
Skull crushers
Dips

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Forearm exercises:

Reverse curls
Wrist curls

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Calves 6x a week.
Abs 6x a week.

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This lets me hit chest and arms 3x a week.
Everything else 2x a week. I can switch it up if i want to hit a different muscle group 3x a week instead of arms or chest.
Each muscle group gets 48 hours of rest so no overtraining even as a natty. This gave me the best results.
It's also Arnold Schwarzenegger's recommended routine for advanced lifters, although he trains everything 3x a week but this is only possible if you go to the gym twice a day 3x a week which is his famous split day routine.

This split is much more preferred than say a push/pull of full body imo because your muscles are all fresh. Instead of having tired shoulders after finishing bench press. And a full body routine is extremely taxing combing legs, chest, shoulders, back etc all together. You can also only do less exercises on a full body because you simply lack the energy to put it all in a single day.