
Originally Posted by
sluggers
The glove hand has little to do with generating speed. The elites drop their glove hand, but they are not pulling the arm down. The problem with doing anything aggressive with the glove hand is that it will tend to force the pitcher "off line" with the arm and body.
The upper body pitching motion consists of several rotating rods that work in sequence. The first rotating rod is the shoulder, the second is the upper arm, the third is the lower arm, the fourth is the wrist and the fifth are the fingers. So, the entire rod is *not* from the shoulder to the ball, but rather from the neck to the ball. Pulling down aggressively with the left arm will take the shoulder movement out of the pitching equation, resulting in a lower net speed.
My DD had a maximum top speed of 67 mph. She cruised at 62+ mph. She didn't pull down with her glove hand, but rather kept it above her waist after the "point". (Please don't tell me her fielding must have been poor because her glove was up. She was a great fielder.)