Bat Speed -- Baseball Hitting Forum

Posted by: Jack Mankin (MrBatspeed@aol.com) on Tue Nov 29 21:51:34 2005

>>> The clip (http://www.batspeed.com/media/WhipHigh.wmv) is an excellent demonstration of your point regarding the blocking of linear motion. I agree that a linear hand path cannot create a “whip” effect and the same would be true of the hips IF linear hip slide were “blocked”.

However, I do not believe that hip slide is blocked or stopped by the firm front side in the way your clip illustrates. One role of the front leg is to redirect the front hip as it approaches its limit and help change linear motion into rotational motion by turning the front hip. In most cases, my pro clips reveal that the hips show detectable hip rotation 1-3 frames BEFORE the forward limit of hip slide is reached. The fact that hip rotation usually begins BEFORE linear hip motion ends is compelling evidence that the front leg redirects the motion of the front hip. One would think that if this relationship did not exist we would never see hip rotation beginning prior to the end of hip slide. In no cases are there stopping or blocking of linear motion and then starting of hip rotation. Linear leads fluidly into rotation.

Think of it as a car driving in a straight line and then turning into a curve. The car doesn’t have to stop in order to turn. Neither does the front hip.

The “whip effect” analogy does not relate to the hips because appendages are not involved as they are with the upper torso and arms.

I do not mean to imply that linear hip slide is the main source of energy created by the hips during rotation. It is not. The interaction of both legs and the torso muscles creates vastly more energy. It does, however, make sense that hip rotation building off of body parts that are already in motion will be stronger than hip rotation that must build off of static body parts. <<<

Hi Jim

It would be a pretty boring discussion board if we all agreed on all points. You seem to think the front leg redirects hip slide into rotation. I say that torque applied to the hips from the extension of the lead-leg is the key to good rotation. I do not see the front hip redirecting as it slides forward - I see it being driven rearward.

Jack Mankin

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Re: Re: Re: Weight shift and rotation SJD [ Wed Nov 30 14:01:55 2005 ]

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> >>> The clip (http://www.batspeed.com/media/WhipHigh.wmv) is an excellent demonstration of your point regarding the blocking of linear motion. I agree that a linear hand path cannot create a “whip” effect and the same would be true of the hips IF linear hip slide were “blocked”.
> 
> However, I do not believe that hip slide is blocked or stopped by the firm front side in the way your clip illustrates. One role of the front leg is to redirect the front hip as it approaches its limit and help change linear motion into rotational motion by turning the front hip. In most cases, my pro clips reveal that the hips show detectable hip rotation 1-3 frames BEFORE the forward limit of hip slide is reached. The fact that hip rotation usually begins BEFORE linear hip motion ends is compelling evidence that the front leg redirects the motion of the front hip. One would think that if this relationship did not exist we would never see hip rotation beginning prior to the end of hip slide. In no cases are there stopping or blocking of linear motion and then starting of hip rotation. Linear leads fluidly into rotation.
> 
> Think of it as a car driving in a straight line and then turning into a curve. The car doesn’t have to stop in order to turn. Neither does the front hip.
> 
> The “whip effect” analogy does not relate to the hips because appendages are not involved as they are with the upper torso and arms.
> 
> I do not mean to imply that linear hip slide is the main source of energy created by the hips during rotation. It is not. The interaction of both legs and the torso muscles creates vastly more energy. It does, however, make sense that hip rotation building off of body parts that are already in motion will be stronger than hip rotation that must build off of static body parts. <<<
> 
> Hi Jim
> 
> It would be a pretty boring discussion board if we all agreed on all points. You seem to think the front leg redirects hip slide into rotation. I say that torque applied to the hips from the extension of the lead-leg is the key to good rotation. I do not see the front hip redirecting as it slides forward - I see it being driven rearward.
> 
> Jack Mankin

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