I think that having a morning meeting is very important so the students feel prepared for the day because they know what they should expect going into it. It is a great time to make announcements and give reminders for behaviors for the day such as "Now rememebr, if we want to get our price we need to make sure that we aren't talking in line when we go to recess!"
Having positive affirmations in the morning before you start the day and even at the end of the day after along day befre the kids go home cam be very important. When done in the morning, it can help give confidence to do things for the rest of the day and when it is done at the end of the day, it can remind kids that they are still amazing even if they had a rough day.
I have found through KCLC that after the students do a very high energy sctivity such as recess, we have a hard time transitioning back to calm classroom time. I think that I want to make it a routine to do a few deep breaths as meditation when students come back from a high energy activity to try and calm them down so they can pay attention a little better in class.