The 20-4 drill focuses on strike accuracy and ball control.
The pitcher starts anywhere from one half to her full normal pitching distance, depending on her development and skill.
This drill requires the pitcher to pitch 20 strikes for every 4 balls she pitches. If she pitches the fourth ball before getting the 20th strike, she starts over.
The pitcher should be encouraged to pitch slower, at about 60% of her normal pitching speed, focusing on accuracy.
Be careful to not overwork the pitcher in this drill, because it requires a lot of repetitive pitching, with less downtime between pitches.
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