I would suggest a standing desk too...
I worked for some years standing because I was having back problems and it was very good for me. You can read about it, there are ways to do it so it is not harmful. Like having a small foot stand to switch the weight from time to time. There are chairs designed for this too. A bit like high bar chairs but designed in a way that you are standing up but it supports some of your weight.
I guess its different for everybody but it feels more natural to me to stand up even in front of a computer and when my day is done, I can sit down and relax instead of wanting to just stand up and move haha...
Now that I am away, I work sit and at the end of the day I feel like golum or mr burns