re: Shooting free throws underhand is superior; However almost no one does it

Throw a Skee ball overhand and then throw it underhand for about 10 minutes and keep track.

I'd bet you underhand was more successful by a wide-margin.

It's not rocket-science but there's science behind it.

This is not a new concept, they were talking about this in the 80's and all the civilian free-throw shooters who did it like 2,000 in a row - all underhand.