What Fastball Should I Be Throwing 2Seam Vs 4Seam

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What type of fastball should you be teaching your players? There are several different types, but the main two are 4-Seam and 2-Seam. Here are David Birkby's...

baseball, baseball training, pitching, fastballs, teaching fastballs, 2-seam, 4-seam fastball
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