[SeijiSensei]

The current fansub calls it "squash," but they're really playing "racquetball." The latter uses short-handled racquets and a rubber ball about six cm in diameter that has a lot of bounce. Squash uses longer-handled racquets and a smaller, "dead" ball with essentially no bounce. Having played both in my younger years, squash is by far the harder game. Because the ball doesn't come to you, you're constantly running to where you expect the ball to land.