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Squad, can you see the little red and white "You Tube" button on the tool bar, right above the smile face, and right below the BOLD button, do you think you could learn how to use it so we do not have to hit the link and open a new window, makes it easier for all of us.

biceps supinate and flex, so why would anyone curl palms face up?
it is better to twist for development
Only for the bicep is it better to twist-or supitnate, the LARGEST flexing muscle of the arm is the Brachiialis, which is right below the bicep, and it is purely an elbow flexer, not a supinator.