Taspony

Taspony (タスポニー; stylized as TASPONY) is a new sport devised in Nagoya City, Aichi Prefecture, and its basic rules are similar to tennis. Instead of a tennis ball, it is a ball game in which a sponge ball with a diameter of 17 cm and a weight of about 50 g is hit by hand.

Taspony is first mentioned at the end of episode 2 of Season 2 by Recchiri-sensei, but expanded on in episode 3.