Hooking the rubber to the best of my knowledge was something the Dodgers used to teach back when there was such a thing called "the Dodger way" of baseball. Sandy koufax was famous for it, Orel hershiser used it to drop his 1985 19-3 season, and Pedro swore by it because koufax taught it to him.
For anyone who knows, i get pain in the shoulder that shoots down the tricep to the elbow (not soreness, pain) whenever i go above about 60%-65% effort. I have no painin any other activities, and the doctor cleared any actual problem with the shoulder. It's been a reoccurring issue for about a month and a half now. I've heard that having an anterior tilted pelvis can cause muscle imbalances that can cause similar issues, but im not certain. Im 16 in high-school and literally anything would help.
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My hot take is that it probably emerged as a way to subconsciously inculcate drift back before the pitching industrial complex even had a term for it 😂
That’s actually crazy when I was about 10 I always thought his sock was bloody because he had his foot like that but my dad told me it wasn’t that but I guess I was right!