I just like to bring everybody in, talk about what was good at practice, what needs to change, things we will work on next time, please show up for tumbling, don't forget to make a payment, etc, etc... Then just get in a circle with hands in and say something I deem to be important for that day, i.e.- Teamwork, Team, Focus, On Time, Work, Fierce, Hit, etc...
I think it is absolutely ESSENTIAL to send them out on a good note and to communicate with them about what you expect from them. Feedback is really important! I also think it's important to bring them in at the beginning of practice and give them an idea of what you're going to work on for that practice. It gives them a sense of direction imo:)