Posted by: Shawn () on Tue Jul 29 11:08:42 2008

> > >>> Many lefties will over rotate because of these facts. And just to prove the same old story it's their backside that swings over the plate, why?, because you rotate around the front hip joint. <<<
> >
> > Hi All
> >
> > I must disagree with both of Shawns above statements. The same old stories you hear about the body swinging like a gate are not supported with video analysis. A frame-by-frame analysis of their swings shows that their axis of rotation is not the front-hip. They rotate about the center of their body – the spine.
> >
> > I will place below a post I wrote on this topic along with a video clip to support it. Once you have studied our opposing positions, your can draw your own conclusions.
> >
> > <a href="http://www.batspeed.com/messageboard/121273.html">What generates hip rotation</a –
> >
> >
> > Jack Mankin
>
>
> Jack,
>
> I agree that rotation is not around the front hip, but I am not in agreement that rotation is around the spine.
>
> In reading your post I believe you stated that the forward push is not turned into rotational energy.
>
> Can there not be forward momentum with out weight shift until "go"? Can't the weight shift put the front foot down, so your weight will remain over your rear hip? So the axis of rotation is not really an axis but a joint the rear hip to be more specific.
>
> I ask because IMO the body produces forward momentum without the weight shifting until you push off of the back leg. The back leg and hands sync together, similar to throwing. The weight shift is blocked by the front leg.
>
> I may be rambling a bit, again hard to explain in written words.
>
> Graylon

Hi Jack,

I think by now since you have the software to do a complete analysis and the ability to go back and forth between frames that you might see what is happening better.

Most of your findings and beliefs were based on using a VCR.

There are some things I would disagree with you on. And there are some things I agree with or see differently.

In order for the spine to be the center of rotation, both legs would have to work equally. Meaning they would have to work equally together with the hips to turn the body.

I haven't read your link yet, so I'll get to that in a moment.

I think from what I've read from you in the past you see the legs/hips working in the manner I mentioned above.

So if the link doesn't clear things up for me, how do you think the hips/legs work, for all to see/hear.

And I'll tell you how I see them working.

Shawn

note: Since most left handed hitters keep the front foot closed. They create a bigger gate swing, this why the backside often swings around towards the plate. The back foot might move a little movement toward the plate or it might be more magnified depending on the swing. It can happen on inside and outside pitches.