javasource
6-4-3 = 2
Holy smokes, JJ... I'm still laughing...
I do apologize... I have not read all the posts on this thread... in fact, I'm typing this offline - because of all those pesky video ads this site now has are sucking my bandwidth dry.
Anyway... Good overlap is the result of one thing: GREAT FORWARD MOMENTUM PRIOR TO THE BEGINNING OF THE BACKSWING.
People tend to obsess over what the drive foot/leg are doing... and they look passed the stride leg. Let's think about this.. but first... know that transferring weight to the stride foot is something I prefer.
Transferring weight to the stride foot is a negative move.
A negative move CAN accentuate the resulting positive move.
Having said those things... the negative move... or simply camping out on the rear leg to start... can destroy good overlap (or... as I said, GREAT FORWARD MOMENTUM).
I'm not a fan of camping out (starting with weight over the stride leg) for the simple reason that I know it is less than OPTIMAL. I want optimal. The best bang for the buck.
Getting back to the negative move... the intended response from performing a negative move is to answer with a more powerful positive move.
Negative is backwards... positive is forwards.
When a pitcher's rear gets over their stride foot... and then their head over their rear, they are not performing a negative move...
... they are putting their weight - or COM - over their stride foot. This is a vertical position...
This position applies vertical force to the ground. Some of that force is returned... much is absorbed... either way, it's returned in a direction I do NOT want a pitcher going... UPWARD.
In order for the force our stride leg is applying to the ground to be returned FORWARD... our COM (center of mass) MUST STAY IN FRONT OF OUR STRIDE FOOT POSITION ON THE GROUND.
Still awake? Here's a pretty picture... but forget staring at the drive leg... LOOK AT HER STRIDE LEG. What do you see it doing?
Note how her head is in front of her butt... and notice how her butt is in front of her stride foot... and notice that her lower leg angle is DIAGONAL.
This allows her to applying Diagonal force (rearward and downward) to the ground.
The ground returns diagonal force (forward and upward).
Now, you can be happy with simply doing this... or you can concern yourself with creating GREAT MOMENTUM FORWARD.
How is Yukiko doing this?
Let's slow it down a bit.. note the action of the lower stride leg:
Right... she's pushing forward with her stride leg!!! Now, she's using the force the ground gives her... and her own force. Bingo... great FORWARD MOMENTUM.
<<<<<IMPORTANT>>>>>
Note how the ball hasn't left her side.
Note that she's pushing so freakin' hard with her stride foot... that it actually slides backwards off the plate.
Long lesson... but the key to implementing this is to make sure you understand when the backswing begins. It begins when it passes her side.
DO NOT BEGIN YOUR BACKSWING UNTIL YOU'VE:
1) Performed a negative move that returns positive force.
2) Used your stride leg for something other than standing... (i.e. push).