My brother and I did the same thing. In grade school, we lived super-rural. No close neighbors, one room school house the whole bit. Playing baseball was our main activity from mid March until the snow flew in the fall. Both of us grew up with strong arms. I am convinced it is because we would throw so damn much when we were younger. Even invented ways to throw a ball. Baseball was on the radio then and very rarely on TV.(this was in the 50s.) When I heard of the knuckleball, I thought they meant gripping the ball with your knuckles. Eventually learned different, but it still remained my grip for a changeup in high school
