I have worked hard over the past few months at keeping my posture as I used to (and still do sometimes!) stand up on my downswing with a nasty over the top and early extension. I have been working hard on this, but now that my swing plane is more inside/out and my posture is getting better, I seem to be doing a 'crunch' during my downswing. I cannot find much on what this is so I can work on it, but was hoping that someone could tell me what this is called, so I can make it my next focus (as it causes me to hit Fat sometimes).
here is a video where you can clearly see it happening, I can't hit balls in the yard so no contact, but I am not looking for a swing analysis, but rather what this 'crunch' is called so I can research it