As a new middle school teacher I've tried to think of new ways to keep my students motivated to come to school. I introduced this idea to my students this year and they love it. Sickness has kept them from earning their first reward, but they talk about coming to school to try to get their prize. I have a feeling that this will be a GREAT motivator in the spring when everyone would rather be outside.
If you're interested in this click the picture to find out a little more about it.