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Summary
A pitcher's arsenal isn't just a collection of good pitches. Off-speed pitches should complement your fastball to be most effective. This means they need to be deceptive enough to keep a batter guessing, and distinctive enough to keep them off-balance.
Speed is king. We all know you want your fastball to be as fast as possible. Look for other pitches to have a distinct separation from your fastball velocity to be most effective. Variations in speed can disrupt a batter's timing.
Arm Slot is the angle of your arm just before release. Consistency here is key. Although a slight deviation from your fastball Arm Slot might improve the shape of a pitch, it can also make it easier for a batter to predict what's coming. Arm Slot is shown from the pitcher's point of view.
Movement describes how much aerodynamic forces affect the flight of the ball. Although it often seems like more is better, that's not always the case. Look for each of your pitches to have a distinct movement pattern. Movement is shown from the pitcher's point of view.