If you want bigger biceps you need to add the concentration curl to your bicep routine. It showed the highest activation of muscle fibers compared to preacher's curl, barbell curl, chin-ups, and incline curl. If you want to see what a concentration curl looks like click on the youtube link.
https://www.acefitness.org/continuing-education/prosource/august-2014/4933/ace-study-reveals-best-biceps-exercises/#
https://youtu.be/ZcU2hN76UyA
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