Originally Posted by limitup
You hang the ball at your contact point, which is well above your head. Why would you have to duck??
Depends what you find at the right height to hang it from (Ceiling? Overhead bar or branch?) and the length of line needed to suspend it at the right height. Again this is intended for 9-10 Y/O kids, so it would hang low, probably with a long enough line that a mishit could send it swing in many directions.
Even if it wasn't a long enough tether to swing back or around at anyone's head, it would likely be low enough to cause an instinctive ducking, which I 'd be leery of having as a reaction in finishing the service motion.
Thanks for your thoughts, I don't wish to further hijack the thread about the "Contraption".