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WORK THE RIGHT MUSCLES THE RIGHT AMOUNT
I'm sure if I asked you to flex, but without specifying a muscle group, you would flex your biceps.
Time and time again, people who want bigger arms focus almost exclusively on their biceps. What so many people fail to realize is that your triceps, not your biceps, are the largest muscle group in your arms.
Bigger Arms - Blog - Testosterone replacement & general men's health articles