I switched to a standing desk several weeks ago. So far I’m loving it. My back does get a bit tired by the end of the day, but not so much that it dissuades me. I’m standing for most of the workday at this point, stopping for a rest for at most 45 minutes out of the day. I also do 3 2 minute sessions on an interval trainer I picked up. You can just barely see it tucked under the desk to my right in the photo. And yes, my office is generally as messy as how it looks in this photo.