The ping pong step is a very popular zouk step. The ladies are dancing the lateral step, and the guys too crossing backwards but the position is other as usual.
For the ladies: Important to do your third step always to the front and to bend your upper body to your partner. With your arms: If you turn to the right you bring your right arm up. If you turn to the left, you bring your left arm up. You will change the arms always on two. If you don’t feel confident with the arms, just stay with the arms up and stretched the hole time.
For the guys: You do the lateral step crossing backwards and you change the hand. If you want to get the lady and do the basic step, you won’t go with the right to the right on 1 but you will cross with the right to the left and bring the lady into the basic step.