If you want to beat the tar out of each other, go somewhere else and play.
The constant rough housing at this stage, ages 3 and 7, is going to make me lose my mind. I'm constantly yelling things like, "NO DOOR PLAY!" "NO GRABBING EACH OTHER BY THE NECK!" "IF YOU AREN'T HAVING FUN THEN STOP PLAYING WITH HIM!" "THIS IS WHAT HAPPENS WHEN YOU PLAY WITH DOORS!"