It seems as I watch the game that a lot of youth pitchers do not grasp the reasoning of the change-up. In their minds they believe that its changing speeds "drastically" that keeps a good batter off balance. In doing so they slow their change-up into "lob ball" velocity trying to razzle dazzle the batter. While this may work at some youth little league level with poor or mediocre hitters, it is a recipe for launch zone in higher play such as travel or HS. I have had people tell me that there is not much difference between my sons fastball and his change-up and that he should slow it down more. I tell them though that I don't want son to throw lob balls that get creamed. As batters advance into HS they become better trained at determining differences in pitch velocities and other deceptions that pitchers use such as break or tail on pitches.
At what point does a change-up become just a "lob ball"? Is it when a batter has enough time to double clutch and adjust? Is it when the pitch is slower than the fastball by more than 20%? What is the criteria between a good change-up and just a poor attempt at it?
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