In boxing, unruly or extremely violent behavior by one of the contestants often results in the fighter breaking the rules being penalized with a points reduction, or, in extreme cases, disqualification. Outlawed tactics in boxing include hitting the opponent on the back of the head, under the belly during clinching, and to the back. Other tactics that are outlawed, but less seen, are pushing an opponent extremely hard to the floor, kicking, or hitting repeatedly after the round has ended. Similar actions have also happened in ice hockey and Australian Football League matches.