Mine is ITFs reverse turning kick. Spinning the leg with no chamber is slower and with weaker momentum. It's like swinging a log stiffly rather than slingshoting it. There is no discernable benefit to it either. Slower and less powerful than a spinning hook kick...The leg is heavier to swing around If you don't tuck it in Annoyingly enough it was a favorite of my club, while the spinning hook kick was completely neglected.