First off, House did not get this information by watching tennis players!!!
This information was first introduced to the baseball world by Dr. Mike Marshall who house is well aware of. The fact that he has made this story up shows his contempt for Marshall by not giving credit where credit is due. Shameful at best.
When you finally understand why pronation eliminated this problem, then you will have something to say that makes sense.
You seem to think all these things are velocity oriented?
They are not, strength only bullet proofs the ballistic activity. Only neural improvements (fast twitch recruitment) improves velocity after fitness. The physiology work that has already been produced in thousands of studies prove this yet you guys keep bastardizing the principles as if you know what your talking about when you don’t.
You may want to consider the fact that the hand and ball are already decelerating at and before release with the conventional pitching motion. This was proven by Dr.Mike Marshall with his ground breaking High speed video analysis of that motion almost 40 years ago where he produced an overhead acceleration graph of every inch of movement in the forwards kinetic chain and the movements before the kinetic chain that starts at fully outwardly rotated Humerus.
You should also notice that the Humerus in tennis serves remains in alignment with the acromial line (line running from shoulder to shoulder) and why they do not produce injuries there, as Marshall postulated it wouldn’t.
Because it replicates “sport specifically” instead of guessing what muscles decelerate a given forwards mechanic!
Holding weight in a sock though is not the way to do it for many reasons.
Absolutely not the same!!! Baseball pitchers accelerate either “axipetally (over the top) or “centripetally” (off to the side) that has the arm conversely decelerate in the opposite motion depending upon the voluntary action or involuntary action learned. Why would you trust your rudimentary knowledge of what muscles it takes to train the action by concentrically training them when wrist weights perform the proper sport specific neural signaling eccentrically, a totally different animal.
GIRD has nothing to do with horizontally flexing the Humerus the way conventional pitchers perform. Conventional pitchers do not even internally rotate their Humerus during drive, they horizontally drive their Humerus by flexing their pectoralis major not flexing their latissimus Dorsi’s.
Conventional Pitchers do not injure their shoulders because of the mythical GIRD as House thinks!
They injure their inner shoulders (Glenno Humeral ligaments and Labrum) because of miss-alignment of the Humerus and the shoulders at glove side foot plant and the alignment-alignment of the shoulders and Humerus to the field driveline.
They injure their deceleration muscles (mainly the tiny Terres minor) because of flinging their arms across the flexed Pectorals major because they do not rotate 180 degrees.
All these injuries are avoidable with just pre mechanical fixes let alone fitness.