If the program calls for 12 reps, then you chose a weight that you can do 12 times with good form. Not 11 and not 13. If you can do only 11 with good form, you've chosen a weight that is too heavy. If you can do 13 with good form, you've chosen a weight that is too light. The author can't say what weight to exactly use because what weight is good for one person at 12 reps might not be appropriate for another. He can say how many reps and how many set and how much rest. Those are constants in NROL. The weight is the variable. If he gave you sets and a specific weight as constants, he'd have to leave reps as the variable.
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