I see fastball mentioned in thread after thread but the spin that this pitch has, or should have, is never brought up or specified.
I think a fastball is the whatever release and resulting spin that a pitcher uses for her fastest pitch and the one she can spot the best. I believe that a ball released with the thumb/palm oriented about 45 degrees from the flight path is coming off the fingertips at their fastest point in the release.
For a girl that comes to me saying her coach wants a screw ball, I tell her to throw her FB inside. So far, they've been happy with it.
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