They recommend 6-8 for size and 10-15 for tone or lean.
Actually, I'd say 12 reps is the most for muscle size. 6-8 will get you size, but if you go 8-12, it may help you even more with size, if you perform it correctly. Getting down any lower or around 6 reps, will mainly work on strength. When working on size, I like to stick around 6ish-8ish - 12. When training for purely strength, I will go 2-6.
Getting your muscles tone, has more to do with diet than anything. The higher reps (15+) is more of an endurance factor than getting tone.
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