This is a companion piece to my previous post. The longer you hang around this game, the more you'll learn all the "helpful" cliches. One of these is "keep your head in" or the negative version "you're pulling your head out." Generally speaking it's true, but the statement ignores the root cause.

The head pulls out because the body stands straight up and the front shoulder pulls out. But no one ever tells hitters to keep their front shoulders in. If they keep their weight in and let the front shoulder get knocked out by the back shoulder on the swing, the head will stay in where it belongs. And the hitter will be able to see the ball just fine, because the eyes will be closer to the ball, instead of moving away from it.