So we decided to experiment and up they stood...
The first thing I noticed was how I could no longer see everyone anymore, haha - some of those 14 year olds are much taller than me! So I had to stand on something to speak to everyone: not ideal, but my students were loving it!
Once students were getting on with the task I had set them, I stepped back and observed. I couldn't believe it, what looked so uncomfortable from my perspective, was actually having a really positive effect on the students. They were concentrating and smiling like crazy! Now, don't get me wrong, I did have a few Lazy Louie's who were 'tired' (aw bless - welcome to my world, son) and wanted to slob over the desk, but once they saw everyone else getting on with it they soon complied.
My conclusion therefore, is to combine the two strategies. Perhaps during 'listening time' students can be sitting, but during independent or collaboration tasks, students can stand up. Best of both worlds then!
Have you ever tried a standing classroom and what was your experience? Let me know in the comments! If you haven't, why not give it a go and share how you got on in your classroom!