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Haha just work the other arm a little more to balance it out.
~Antithesis
This is wrong, you should use Dumb bells more and keep the weight alittle lower than normal, this will still work both arms quite abit, but will allow for your weaker arm to close the difference gap between them without straining/injuring your weaker arm.
Ive actually got this problem, I used to hit the gym alot, but this year at uni Ive just started playing American Football(Im English) and am the QB, so I've been throwing shit loads this year, and my right arm is was much stronger, but now Im hitting the gym again, doing the above, its getting much better, mainly see the inprovement when your bench pressing.