Rep range can have a little freedom. The 8-12 is great for both building muscle and burning fat but im sure going 6-10 won't be a problem. The thing is when you really find your working weight you will only get one more rep each work session. When you get to the upper end of the reps (12) you will be so glad to go back to 8 even though you have to add weight.
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Slowly progressing
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