There is no one thing. It is unrealistic, and if one thing worked, everybody would probably do it. People can't blame children for fooling around. Kids migrate to the least effective form of management. If you were listening to monologues on this and that, it would be difficult for you to stay focused.
Students hate being bored, and they hate to sit passively.
They want to do something. They need to give students more breaks. Almost everything has made the teacher's job tougher. Legislators have mandated Band-Aids for years and haven't helped. They don't understand how complex it is.