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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.
Now that you know how many reps per set is most ideal for your goal, the next thing you need to figure out is how many TOTAL reps, sets and exercises you should do per workout, per week and per muscle group.