The game of baseball is 90%mental and10% physical.
Mental preparation includes understanding everything a good ball player can learn about the team he is about to face. As the other team warms up, the smart ball player will notice:
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Who has a strong arm
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The right-handedness or left-handedness of the pitcher and/or infielders
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What weaknesses or tendencies the pitcher has
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The quickness of the defense
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The communication between the pitcher and the catcher
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The conditions on the field, including the backstop and how it will affect a ball that hits it