Optional arm styling for the rock "arc" steps: for the rocks starting with the left foot (rocking forward or back, it is the same), start with elbows at your side, forearms in front of you, hands in light fist. On count 1, straighten left arm down to left side, right forearm moves up slightly and shoulders dip to the left (left shoulder goes down while right one goes up). On the &, left arm comes back up, right arm straightens down to right side, and shoulders dip to the right. On count 2, left arm straightens down to left side again, right arm comes back to starting position, no shoulder movement. Movements are opposite for rocks starting with the right foot.