Secondly softball pitchers must do this from a flat ground position. 5 of second, then we are talking about milliseconds of time when the body needs to properly move through these planes, not a great deal of time to make up for any error. Adding more movements through more planes of motion drastically increases the difficulty of the task because it has to be done at a high rate of speed, and it can create more chance of error in sequencing of these movements. That is a second additional sequence of 3 planes that the hitter and the golfer do not have to move through. the motion is delivered on a flat surface as opposed to a downhill slope. It goes through all 3 planes of motion (sagittal, frontal, and transverse) twice in one delivery and 2. Underhand requires 2 very significant differences: 1.
What makes underhand pitching distinctly different than overhand pitching goes beyond the direction of the arm circle. This however does not by any means automatically classify an underhand pitching motion as “natural” or easier on the body.
When we look at an underhand motion we cannot compare the forces at the shoulder and elbow as that to an overhand thrower, an underhand motion does not require extreme amounts of external rotation mobility and thus does not have the speed of internal rotation causing potential damage to shoulders and elbows. It makes a lot of sense as to why we see a high number of upper body injuries in pitchers at all levels and ages. That speed of rotation makes it very challenging for the shoulder and elbow to handle those forces being generated. The pitch is delivered when the arm internally rotates, at roughly 7500 degrees per second for elite level MLB pitchers. Mobility that is uniquely acquired by the thrower through the course of their skill development as well as through the course of a season. We know that overhand throwing motions, pitching and non-pitching, place a great amount of stress on the elbow and shoulder of the thrower when the throwing arm lays back prior to release that require a great amount of external rotation mobility at the shoulder. Let’s first clarify what the typical “it’s a natural motion” is referring to. We have heard countless times before that an underhand (fastpitch) pitching motion is far easier than a baseball overhand pitching motion, to which I couldn’t disagree more.
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