Barbell curls and dumbbell curls train the same muscles through the same basic motion. The difference is what your hands are holding. A barbell locks both hands to one straight bar, and dumbbells let each arm move and rotate on its own.
Both build the biceps well. Which one suits you comes down to how your wrists and elbows handle a straight bar and how you like to add weight. Below are the pros and cons of each, how to do both, where the EZ bar fits, and which one I’d pick.
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