I understand that "squishing the bug" is bad advice. What I have not been able to find in my online searching is why it is incorrect. Anyone care to help me understand that?
TNSD:
Happy to give it a shot. (BTW, great pics by Jofus).
A hitter "squishing the bug" is grinding the dirt under the front half of the rear foot. Perfect analogy for that action, easily grasped, easy to do.
And that's unfortunate, because this is not an action performed by elite hitters, male or female. Instead, elite hitters roll up onto the toes of their rear foot, almost ballet-like.
And obviously, they would not be able to do this if there was much weight remaining on the rear foot. But there isn't. The hitter creates forward momentum, the mass transfers to the front side, and the player rotates the hips / core / torso to key the swing. THIS IS CRUCIAL. Absent this rotation, the weight will continue to move forward, get outside the front leg, and the hitter will lunge. DEFINITELY want to avoid that.
(An important side note is that even as the lower body mass is shifting forward, the upper body does stay slightly back. And is subsequently pulled into rotation by the core. A line drawn through the center of a hitter's body AT CONTACT might look something like this: \ - see the big picture of Pujols above. I would say that the upper body position of the SMALLER picture - more vertical than in the other - is a slight anonaly based on his individual mechanics, and the fact that the pitch was very high - well above the MLB strike zone, in fact. Not the norm.)
A hitter "squishing the bug" still has weight on the rear side. That is the first problem. Probably not the biggest problem, however. I would say the biggest problem is that the hitter is GENERALLY doing nothing to rotate the hips when she squishes the bug. And this is easy to demonstrate. Stand opposite your hitter (with or without a bat). Have her get into a loaded position. Now, grasp both of her shoulders, firmly, and ask her to rotate her hips and start the lower body swing. Don;t release her shoulders. 95% + of the time, the hitter will grind / squish with her rear foot, and the rear knee will rotate inward. The hips will do nothing. Obviously, the hitter is not creating any force with her hips / core. The result will be a very arms-dependent swing. Less consistent, much less powerful, ESPECIALLY for a female hitter, This is almost always something I do within the first 15 minutes of working with a hitter. Great health-check. After a while, you can tell with the naked eye, but occasionally, I get fooled. Can't recall getting fooled in a positive way - hitter rotating hips / core more powerfully than it appears. Almost always, I find the opposite - hitter looks as if she is creating rotational force with the core, but isn't.
(This simple check also illustrates another reality of the swing - how the shoulders are pulled into rotation by the core. Think of it like a roller coaster. The front cars of the train are the hips / torso, the last car is the shoulders. Ride in the last car, and you'll feel the whip as it gets pulled over the first hill by the already accelerating front of the train. Slight separation creating instant acceleration of the last car - or shoulders.)
I wouldn't get hung up on a player getting all the way up on the toes of her rear foot immediately. It will take some time. It really isn't something I key on. As the swing gets healthy, it just happens. The roll-up onto the rear toes is an EFFECT, not a causal action. Assuming the mass has moved forward, the front side has firmed up, and core-based rotation is occurring, the back foot kind of just does what it does. The forces in play cause it to roll up as the rear hip finishes rotation. If it didn't, it would be a slight anchor to that rotation.
Just after contact, many hitters find their mass / weight flowing back to the rear side, and the rear foot toes will return to the ground. (Other step slightly towards or across the plate with the rear foot). Either is fine.
Hope that helps.
Regards,
Scott