It's not really the reps that you should be targetting - it is a weight that is heavy enough to be genuinely challenging.
You should be using a weight/exercise that is challenging enough to fatigue your muscles in 12 reps or less (the heavier, and the fewer reps the better). But there is little point in using a light weight and stopping at 12 when you can do more. Rather, use a heavier weight.
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
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