[quote=“Chris O’Leary”]I developed this diagram for use in a debate on another board, and thought that some of you might find it interesting. Essentially, it makes the point that the only difference between one arm slot and another is how much you tilt your shoulders.
The idea that a pitcher who throws 3/4 has their elbow bent 90 degrees is a myth.
The diagram seems to depict the position of each pitcher’s arm immediately after release of the ball. At that point, regardless of arm slot, a pitcher’s arm will be mostly extended straight. So I guess it makes sense that at that point the only difference could be the angle of the shoulders. But this seems relatively uninteresting. I think the more interesting thing would be to consider the path taken by each pitcher’s forearm and the maximum angle relative to the upper arm achieved by the forearm.
Ultimately, you can’t discuss arm slot until you have defined it. If you defined it to be just a height above the ground (or, obviously, the angle of the shoulders), then shoulder angle determines arm slot. But I feel arm slot should be defined in relation to other parts of the body that have maintained an upright posture.