I've been standing for a year, no negative side effects to report. Initially my concentration did go down, I think it's now probably back to normal levels. One

I've been standing for a year, no negative side effects to report. Initially my concentration did go down, I think it's now probably back to normal levels. One positive, if you work things other than typing it's much easier now to sketch or assemble hardware. Typing etc is about the same. I do use a foot pad and it provides a noticeable difference. One thing that was not obvious at first was that the biggest difference to foot fatigue/knots has been the type of shoe. I find that Converse 'Chucks' cause the least fatigue. Funnily enough I have the same shoes from Zara that OP has, and they were brutal on my feet in comparison to others. Also to note, I thought that standing would reduce my levels of hip, calf, and ankle tightness after workouts... that hasn't been the case.