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hammer curls activate the brachialis, which is under the bicep. it does this because the way your arm is turned its isometric elbow flexion. normal dumbell curls are a dynamic elbow flexion, and they hit the bicep. i would focus on both, but since i do a push/pull split, i do a lot of my back/pull movements with my elbows in dynamic flexion.. thats why i just do hammers at the end so i hit my arms with an isometric flexion movement