Posted by: tom.guerry (tom.guerry@kp.org) on Thu Nov 29 13:32:12 2001

Jack or Tom etc.,
> > >
> > > I'm involved in a long running discussion with an instructor who teaches linear mechanics. Could you help me out with a discussion of the two mechanics as relates to dealing with changes of speed?
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> > > Thanks,
> > > Mark H
> > >If there was a critical point between the 2 methods I would say it would come during the stride.When most hitters stride they often drive off the rear foot or bring the upper body with the front foot forward.It feels natural to me but it kills the power in the hips particularly when fooled.The axis just comes to forward to rotate on and a linear movement in the lower body has occured with little room to rotate then.Once the lower body has become linear and the axis is shifted forward the upper body is in a poor position to rotate.So the key area is to stride while keeping the upper body over the inside of the rear thigh.then your front bent leg can push back the front hip while the rear knee drives drives forward pulling the rear hip forward.This is the explosive rotational movement that will then cause the upper body to rotate naturally.So I would say that it is easier for the upper body to create the same movement as the lower body ,therefore the lower body is in a way far more important than what we give it credit for here,because it can make or break shoulder turn and the efficency of that turn.
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> I have run through my arguments, gleaned from here and elsewhere as well as some of my own thoughts, but I would like it in someone else's words as to why rotational is better for dealing with pitchers who are good at changing speeds. Also, my friend is under the impression that Jack concedes the weakness of the rotational method as far as dealing with off speed pitches. I remember discussions to the contrary, but I wonder if you would go over this again.
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> Thanks,
> Mark H.

Mark-

There is a discussion at setpro about this.Separation and the kinetic chain allow more potential for timing adjustment than the "one-piece"m (linear) swing which is why

"one-piece swings are easy fodder for the mediocre change-up."

http://www.setpro.com/ubb/Forum1/HTML/000548.html