When I was a classroom teacher I always had a safe spot within my room. It was a spot that students knew they could go to when they were mad, frustrated, sad, etc. to calm down. It helped so that I didn't have to engage them when they were having a strong feeling, or interrupt class. It helped them to be able to self-monitor and to start learning about their feelings and self-control. I encourage the teachers in my building to use a safe spot if they have students with high emotions. It is a spot away from everyone else (not the front of the room) where a student can go and practice belly breathing and other calming strategies without getting in trouble. I put up different signs like this one to help them remember what to do.