Posted by: John () on Tue Dec 30 07:27:53 2008

Hi Tom
>
> Over the years I have read many of Mark's posts and never once found him to have an original thought of his own. His mannerisms and knowledge of the swing was formed in the Nyman era and I doubt he will ever shake those shackles. He has become so close minded to the term "THT" that I doubt he would allow himself to grasp the importance of the bat's rearward acceleration.
>
> No Tom, you have not missed anything. I still emphasize to my students that mechanics that accelerate the bat-head rearward (THT) is an absolute key to a high level swing.
>
> Jack Mankin

Hi,
THT definitly exist, but what causes it has never been well define. First, we have Pre launch THT, that is mainly caused by the backward rotation of the chest. The THT during the launch phase is caused by the forward rotation of the chest toward the ball that causes the shoulder rotation.

I dislike the terminology used for it because the hands don´t have to do the most work.