Teaching Lower Body Baseball Pitching Mechanics

It's been my experience with teaching and learning baseball pitching mechanics that the upper half is much harder to change than the lower half. In other words, once a kid has established his throwing motion, it can be VERY difficult to change those habits.

Therefore, when working with pitchers, focus on that lower half first. Good lower body movement often "self corrects" poor upper body movement!

Do you have any tips on teaching pitching mechanics?