Originally Posted by spacediver
I've never understood how pronation of the forearm can be applied to throwing a football (not saying it's not crucial, just that i'm having a conceptual stumbling block).
If you hold a football, the tip of the football is pointing ahead of you. If you pronate your forearm, the tip of the football now faces to your right.
Don't you want the tip of the football to be pointing in the direction of your target when you throw it?
If so, how can you pronate your forearm while keeping the tip facing the target?
Think about that and visualize the NFL, if you watched any yesterday. How could a QB throw a 30 yard pass if the tip of the football was pointing towards his receiver as he threw it? It needs arch.
A football's tip could point towards the target if he was throwing 10 feet. But not if a ball is thrown a longer distance. Now think about how far a serve has to travel after it leaves a racquet.
As far as pronation, if he held the ball, yes, it would be facing to the right. But what if he pronates through the release?
This site explains it more.
"The key word: PRONATE. Flutie was adamant about pronating your throwing hand through release. (Peyton Manning calls this “flicking boogers.”) He didn’t say it would be nice if you did. He didn’t say that it would probably happen if you extended your hand at the target. He said flat out: you NEED to make the effort to pronate your throwing hand through your release."