Star Thru starts with a boy facing a girl. They will end up as a couple.

The boy lifts his right arm while the girl lifts her left arm, and they touch hands, palm to palm, to form an arch. They both walk forward, and as they start to pass each other the girl "goes under the arch" and turns 1/4 (90 degrees) to her left. Meanwhile the boy keeps walking around the girl, turning 1/4 to his right, and ending up standing to her left. When they are done they lower their hands to the usual height.