During my pitching lessons (& throwing in general) I hear two things all the time -
- “extend towards the glove”
- & for fastballs - keep your fingers behind the ball.
The way my pitching coach has described it to me is that you should feel like your lat muscles (the big muscles in your back) are stretched out and your arm is extended to catcher’s glove (my coach actually said to throw at his cup - but I really would rather extend to the glove).
What is strange when I seem to be lossing velocity and control - somebody (coach or father) reminds to - extend towards the glove and keep my fingers behind the ball - my control comes back and my velocity goes up.
Based on some new science words I learned in school this would be empirical evidence that these two things have some positive impact on my pitching.