Please forgive my ignorance.
Actually I don't understand what it's like to throw an "underhand spiral" because both my friend and I have never played football. (Well, no one knows to play football in Hong Kong)
Is there any clips or pictures on the web that help me understand how to throw an underhand spiral?
Also, what are the differences between the "underhand spiral release" and the "hand-shaking release"?
I am very concerned about not teaching my friend to spin the ball, because it would be quite difficult to correct, from my own experience.