For a more forceful contraction that combines the biceps two major functions, start with your palms facing each other I the down position and rotate them as you curl so they face your shoulders at the top Rotate them back on the way down.
For a more forceful contraction that combines the biceps two major functions, start with your palms facing each other I the down position and rotate them as you curl so they face your shoulders at the top Rotate them back on the way down.