In the International Viennese waltz, in Reverse turn, LF should be crossed in front of RF (step 3 for man and step 6 for lady), but not in Natural turn.
We did not know why? Can someone please help us!

Thank for any responses
HaOanh TranThanh

It's all physics. If you dance continuous natural turns you would travel in a counterclockwise circular manner. The rotational direction (right or clockwise) of a natural turn allows you to progress down the line of dance (left or counterclockwise) while closing your feet on "3".

With continuous reverse turns where the feet close, you would progress down the room in a clockwise circular manner. The reverse turn will not progress down LOD without an over-rotation. Crossing the feet on "3" provides enough over-rotation to allow you to progress down LOD.

In social settings, I have seen dancers cross feet in a natural turn in circumstances where they need the over-rotation to move down LOD or floorcraft.

Blair