『How to Throw a 100-mph Fastball?』のカバーアート

How to Throw a 100-mph Fastball?

How to Throw a 100-mph Fastball?

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Hold the cast so that most of the pressure comes from the thumb side of your index finger. Putting pressure on your index and middle fingers will cause the ball to straighten or become a fastball. Putting pressure on your index and middle fingers will balance the throw.

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