"When it comes to muscle recruitment, it's important to note that even more important than strict grip width is the difference in the width of the grip and that of the elbows.
To target the outer portion of the biceps, the elbows should be much wider than the hands (narrow hands grip/wide elbows position). To target the inner portion we want the hands to be wider than the elbows (wide hands grip/narrow elbows position)." - Christian Thibaudeau
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Elbows-In, Wide Grip Preacher Curl
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