If you are right handed this is most likely why. My left arm has less strength than my right. What you can do to combat this is when you go into the gym start on the left for a while when you do any exercise. What happens is you start on your right from being right handed and you'll exhaust your body doing that exercise before you even start on the left. Not that it's an extreme exhaust, just enough to make a difference. So try starting on the left, and when you notice they are evening out make sure to alternate every other day.
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