"Off your can...? I find that offensive also. Did you know that most (at least myself) teachers teach 6 classes one after another. I do not get planning during the day and I get 30 minutes for my lunch-which I use to hang art, etc. because they use my art room as after school homework space. So, if I need to sit down once in a while-I do not feel guilty about it. I guess I could have been a principal (I am qualified and have the education)and sit a lot. I could have been a CPA and sit a lot, I could have been a CEO and sit a lot. Our brains can still function sitting if we need to occasionally. I do get tired like the other humans on this earth-plus I have up to 30 young children that I enjoy teaching and learning with.