Although I never lift more weight or do a different number of reps with my right arm, it is a little larger and more defined than my left. This is most noticeable in the biceps (14-1/4 inches Right and 13-7/8 Left for a 3/8 inch difference). I'm 5'-7" and about 155 pounds and have made good progress lately, but I definitely want to get my left closer to, or the size of, my right bicep. I don't want to not work the right and only work the left until it catches up, but am really clueless as to a proper way to address this. Any helpful input will be greatly appreciated. Thanks!