I built a standing desk and a sitting desk at the same time when I moved into "downtown" office from my home office. For a year I had them in an "L" and didn't

I built a standing desk and a sitting desk at the same time when I moved into "downtown" office from my home office. For a year I had them in an "L" and didn't really use the standing desk as much as I thought because like the author I would get sore/tired very quickly and the nice chair was always a couple of feet away. About 2 months ago I decided to reorganize my office and I put the sitting desk across the office looking at a wall and the standing desk by a nice window view. With that little bit of change I started using the standing desk more and more and now I use it all day. One important note: I've also been taking a break every 1.5 hours (I have several alarms set on my phone) to do some hamstring stretches on the floor. I bought some cheap interlocking foam flooring that I sit on for stretching. On the days I ignore the reminders to stretch I do start getting a tense back by the mid/end of the day. Maybe I should add some squats...