While seated on an incline bench and with
dumbells
hanging in a palms facing each other position,
curl the dumbells up while slowly rotating
them to a
position where the palms are now facing
the body.
To
work the bicep further during this rotation,
you can
use an offset grip with your thumbs touching
the side
of the dumbell. As with all curling
exercises, try to
prevent any movement of the upper arm.