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How to get better biceps
Do standing barbell curls.
This is probably the best exercise for biceps. The standing barbell curl is what most people think of when they think big biceps.
With the standard variation, you place your hands shoulder-width apart on the barbell, start with your elbows fully extended, and curl your arms upward to bring the barbell up to your chest. Keep your elbows fixed and back straight for proper form.