I switched to a standing desk last year, a few months into work-from-home. Before I got it, I asked a friend who had been using a standing desk for advice. He suggested buying a foam mat to stand on. That seems to work well for me, too. (I work barefoot.)

I find that standing when working helps me concentrate better, though I make more typing mistakes because the position of my hands is different from what I had been used to. I didn’t have serious back problems before, but my back does feel better now that I am sitting less. I don’t stand up all day; I sit down occasionally to rest my legs.

Gel floor mats for standing. ‘anti-fatigue’ mats may be a good search for example.