Little different then book ASA
BUT what I was basically taught at Natl's for SP strike zone. Call anything that comes between the batters' boxes which are 6" from the plate on both sides that come across the batter from mid-chest(batter back nipple) to the front knee. Let the pitcher have 6' to 11' on the arc when they start getting over 11' start bringing them down(Illegal). Also would suggest finding a wall where you can practice throwing a pitch at different heights that you can see standing back about 25'-30', you will be amazed how low a 6' arc looks and that 12' is not very high to get you into your zone.
JMO's
Don
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