I have been using standing desk for a year, trying to switch sitting and standing frequently, in my case at least every hour. Why ? Firstly, my physiotherapist said her stance on the long term standing is negative since it can lead to imbalances - humans tend to put more weight on one feet, for instance. Secondly, there was a long article in local weekly magazine about sitting and standing, basically saying that the human body will adapt to whatever condition there is. For sitting, this means the muscles etc. will eventually "freeze"; the only way how to fight that is constantly subject the body to change in posture.
I care more about my health and long term well being than my company and the code I write. Walking 5 min every 30min won't kill your productivity, it might have the opposite effect actually.
I started exercising when I saw that most of my older peers in the field were fat/obese, had poor posture and no stamina whatsoever, these people are literally rotting day by day sitting in front of a computer
It seems so insane to me that some people internalised the idea that companies and productivity are the #1 priority in life, I can't even begin to wrap my head around that. As if selling your time wasn't enough, now you have to sell your body. Unless you live in some weird hellhole of a country without mandatory rest breaks laws I don't see why you would put yourself through sitting more than a few hours at once
Just the fact that people unirionically ask this question these days make me feel uneasy. Your body is literally screaming at your to move more, not less, listen to it. Work in 30 min blocks and go for walks in between, anything other than "how can I become a passive typing machine which doesn't move a muscle for 8 hours straight" please.
There isn't enough money in the world to buy a setup that will get rid of these issues, just be active, that's all there is, if you know how to sit properly, take breaks and exercise regularly you could use a 5$ ikea stool and never have back/shoulder issues. People want the magic pill to be healthy but focus on all the wrong things...