How do two 20 pound dumbbells compare to a 40 pound barbell for upper body exercises? Are they equivalent, better or worse? - Quora

Answer (1 of 6): Simply put, the main difference here would be “accountability”. With barbell training the assumption is that both arms are providing equal force output to move the weight (20lbs each.) However, there is no way to KNOW that your body is working symmetrically to move the 40lb barbe

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