Don't judge a workout by the "pump" or the "feel". It is not a good indicator of the effectiveness.
I would say if you stay below 12 reps or so you would be in size gaining territory. Getting down closer to 5 reps or less is more like strength training. There is no definately boundary so dont' take those numbers as a solid rule. Its more like:
Higher reps --> Size (to a point)
Lower reps --> Strength
Hope this helps,
IW
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