This afternoon I spent 2 hours rearranging the furniture in my classroom. The carpet was replaced and all the heavy things were shoved together (at the furthest point from where they belong). I know I burned a ton of calories, especially when pushing my huge library bookshelf (full with over 70 books/workbooks) across the room. There were moments when I was pushing as hard as I could and nothing happened.
Naturally, as soon as I finished, a nice gentleman coworker stopped by and offered to help. Oh well, it's the thought that counts :).