When I was in middle school, after lunch we would get a 10-15 minute break. This break was like having a chill recess. During this time you were able to do what you wanted and as a student I thought this was very helpful.
Many students just relaxed during this time by talking with friends, going on their phones, taking a nap, etc. You could also use this time to complete homework, study, or quickly get in an assignment that you were supposed to turn in at the beginning of class.
I often used this time to go on my phone and just listen to music before going back into classwork. I know it was also helpful for teachers because it gave them extra time to grade, plan and do other teacher things.
When the weather got nicer we would go outside which was nice because you got to hang out with friends outside of class. Teachers would often bring games or sports equipment for students to play with outside. A few times in my history class my teacher would bring out a soccer ball or a football. Our class and sometimes other classes would play games and it was a great way to get your mind off of school work and to just relax and have a good time with your friends.
Teachers also enjoyed this because it let them talk with other teachers or just talk with students. There were a ton of times where my friends and I would just talk to our teacher.
I think we should have a short break after lunch because not only does it allow students but teachers to relax a bit before class starts again. It can give students extra time to work, which is very much needed or it can just give them time to relax.
It can help teachers too by giving them more time to do work or also just relax.