Opening to soon?

im not exactly sure about what this opening means, i think it means that when ur shoulders square up to the plate, is this right?

Yes, “opening up” means rotating to face home plate. The term can apply to the shoulders, hips, front leg and front foot. The foot and leg open first, followed by the hips and then the shoulders. Well, that’s what we want to happen.

Ok, I understand it now, thanks alot!