This drill aids the pitcher with an effective visual aid, preventing an early load.
The pitcher holds a glass of water in the pitching hand. A correct pitching motion will allow the glass of water to stay upright until the bottom of the circle, approximately 12 to 18 inches behind the body, as the arm begins to move forward for the wrist snap. At that point the water will spill out of the glass.
An early loader will spill water as soon as she reaches the back side of the top of the circle.
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