It's a variant on tennis that was originally designed for elderly people because it has a safer range of motion in the arm that for some reason has taken off with the college crowd and is now on espn.
Imagine a court that looks like table tennis from Honey I shrunk The kids, then give all the players weird wooden pallets instead of rackets, and then tell them they can't do any overhead swings and you have pickleball.
"History Is Much Like An Endless Waltz. The Three Beats Of War, Peace And Revolution Continue On Forever." - Gundam Wing: Endless Waltz