The “Peppermill Performance”, which is attracting attention from the Japanese national baseball team, was performed by a player at Senbatsu High School Baseball and received a warning from the referee.
The Takano Ren = Japan High School Baseball Federation and others said, “We have been asking players to refrain from unnecessary performances and gestures. We understand the players’ feelings of wanting to enjoy the game, but we want them to enjoy playing.”
Source