I used to do mainly barbell curls untill I noticed that my left bidep was lagging considerably behind my right. Generally the stronger muscle will take more of the load therefore do more work.
I started doing dumbell curls starting with my left arm and going to failure then doing that amount with my right even it could do more. That way you allow the weaker muscle to catch up.
Interesting note now is my left arm is stronger than my right.
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