I don't know about the rest of you, but I get really antsy if I sit for more than 15 minutes at a time. For me, it literally feels like my legs are bubbling full of energy and I absolutely have to stand up, shake them out, and move for a minute before getting back to work at my desk. Luckily for me, I have a job that keeps me moving most of the time. I just posted a video link to the FOX network that did an article about a school incorporating exercise balls into the classroom instead of chairs. I think it is important for you and your students to schedule physical activity or some form of exercise into your daily lessons. Studies have shown that this increases brain activity and it is fun too! If you are short on ideas for how to integrate this into your classroom, I found a few podcasts and vodcasts on itunes that would be perfect for quick "get-up-and-move" minutes. All you have to do is register for itunes.com. Once you have done that you can search for podcasts via subject matter. For this activity I searched for fitness or health podcasts. A great subscription I found showed a series of two-minute exercises for all different parts of the body. You could pull a vodcast up like this every day and have your students learn how to perform all sorts of strength and cardio exercises. After a while you could create your own with your students and post them on your school's website so they could do them at home too! Take a minute every few hours to get up and move and help your students get into that habit as well.