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Yes well to get lean you need low weights with high reps, make sure you are able to perform at least 20 reps regardless of the exercise. Yeah so high reps equals toned and lean while low reps is what you need to get bulky and chiseled.
So, 12 sets for each muscle done once per week = a total weekly volume of 12 sets. Mission accomplished. If you were to train each muscle group 3 times per week, you would need to do about 4 sets for each muscle during each of those 3 weekly workouts.