Imagine a ping pong table blown up to tennis court size so that you can play standing
on the table. Now play your giant ping pong using slightly enlarged paddles and a wiffleball. Essentially it is what you'd end up with if you bred table tennis with regular tennis.
The nature of the ball allows for wicked spin but its lightness prevents it from moving super fast through the air.
Start
here for more information. It was invented in Washington so may have been over-represented in Washington school PE programs. But it was one of my favorites.