Originally Posted by Chenx15
I would like to understand the physics behind pronation. i am not sure how it makes the ball stay up and makes it spin to go down.
Not sure if anyone's already said this, but pronation doesn't make the ball stay up and it doesn't make the ball spin to go down. It simply allows you to use some leverage to get faster racquet speed.
You can hit the ball up or down and with or without spin using pronation.