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Jeff, the extra extension in the release of the pitch towards home plate has different terms but I like some who call it, "Virtual or Visual Velocity." The equation I usually see (warning I am tired if this is wrong) is for each foot released closer to home is worth 3 mph to the pitch. That is one reason Greg Maddux could keep hitters from sitting back.
Can you imagine Randy Johnson with his body letting go about a 1/3 of the way to home plate (okay...slight exaggeration)? Sneaky fast with movement is better than fast without!
Great comeback I see tonight!
Again, fun reading your comments!