I do the one handed toss starting from about the head. If I do the two handed or underhand toss I have to start too low and the players then seem to get in the way. I like to start my throw as high as possible.
I do that practice toss as well but I practice inside the hoop as I can guage how straight it is by throwing it into the hoop.
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Once there was an official who tossed the tip all the way between the rafters. At half-time the second official questioned him about it and he said, "Yeah, my fly was unzipped. While everyone was watching the ball I bent down and zipped up my fly."
A story I heard