One twin only does hammer curls. The other twin only does preacher's biceps curls. Will it make a difference for how their arms look? - Quora
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Uwo Fitness
The hammer curl is the perfect all-around arm builder. It hits the biceps, brachialis and brachioradialis muscles, helping you a… | Muscle fitness, Workout, Fitness
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Which exact muscles do hammer curls target? - Quora
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