@ReluctantO'sFan posted:Maybe I'm misunderstanding (wasn't a physics major), but shouldn't backspin add to the overall distance?
Yes, it absolutely does. Backspin adds to the carry whether it’s a hit ball or a thrown ball. The reason that kids post higher velo with turn & burns (or pull downs or whatever you want to call it) is that they make better use of their lower body when making those throws. They also aren’t thinking about mechanics. We use pull downs as a measure of potential and then try to get kids to take the same athletic movement to the mound. It’s easier said than done. It’s amazing how many kids are initially taught (as young kids) a slow and methodical pitching delivery. We have to get them to unlearn that and speed everything up and use their natural athletic ability.