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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.
Your main work sets are sets three and four. All of your energy is going to be spent trying to get 6 reps with 70% to 80% of your max. Now, as with the bench press, you will increase your weight when you can get 8 reps on set four.