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The hips have initiated, the torso transferred, and the shoulder engaged. The arm develops through, elbow first, unrolling or developing toward the target. Since the hips are forward and the torso
extended toward the plate, the arm reaches out, putting the hand on top of the ball with the fingers cutting through it on a downward plane. This downward cut through the ball is the cause of the slider’s bite down
(and the “red dot” presented to the hitter), the four-seam fastball’s jump, the two-seam tail, and the sinker’s drop, If the hips aren’t forward on release, the hand stays behind the ball, and movement flattens,
velocity drops, and the hitter reminds the pitcher in dramatic fashiopn what happens to flat pitches. The arm continues through the ball, following it’s inertia.
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