Lift heavier weights. In order to put on size do low reps with a high weight. I love seeing this topic staying fairly active.
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Actually for size you need a good amount of hypertrophy. Lower rep ranges is mainly for strength. You'll get mass from lower rep ranges but it'll take longer. That's why if you watch body builders train they do high volume of sets and reps.
http://youtu.be/aY-nEcCLBdE
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