I think we all need a break from whatever we are doing at least every 25 minutes. This keeps us fresh and engaged. I know myself that I get antsy when I sit too long. I usually get up and take a walk, or find a couple minute distraction. In my classroom my students can't just get up and do that. I feel strongly that I need to create a brain break every 20-25 minutes.
I first heard about these breaks from Jean Blaydes Madigan. She has a lot of ideas about movement within the classroom. She came and did a workshop at our school and it was excellent. Since then, I have just heard of different ideas that I can use in my classroom. They have come from colleagues, speakers, or blogs. I want to hear about other peoples brain breaks so I created a website that we can do just that. It is called Brain Breaks. It is at http://brainbreaks.blogspot.com. Check it out and you can write a post as well.