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Why is it hard to flex my non-dominant bicep?
Why is it hard to flex my non-dominant bicep?
It's due to a phenomenon known as the "crossed-extensor reflex." When you flex one arm, your body unconsciously signals the muscles on the opposite side to relax. Therefore, when you try to flex your non-dominant bicep, your dominant arm flexes a bit, which makes it harder to feel the contraction on the other side.