Your stance doesn’t really change over the course of a season, though. You might open or close it (adjust the angle of your body relative to the axis between th

Your stance doesn’t really change over the course of a season, though. You might open or close it (adjust the angle of your body relative to the axis between the mound and the plate) but you wouldn’t normally make large enough changes that your strike zone would suddenly be e.g. two inches taller. That’s as much for your brain as it is for your mechanics; over time you get to know where your zone is in 3D space, and having to re-learn that is painful.