Face your square. This is the person who is next to you diagonally. If you turn your back to your partner, you will be facing your square.
Extend your left arm and place your left hand on the inside of your square's left forearm. Your square will perform the same movement simultaneously. Although you don't actually grip each other's elbows, you will be holding each other's forearms just below the elbows.
Turn in a counterclockwise circle with your square.
Release your grip as you complete the circle. You should be facing your partner at this point.