I have a sitting/standing desk, at home and when h have to go into the office.

I use them to… sit.

I'm not using it as much as I should be, but it is genuinely a pleasant improvement over sitting all day long. A really expensive chair can do you a lot of good, but nothing beats the mobility of standing. When I read something or watch something I can do some light exercise for my legs, squatting a tiny bit and moving my upper body left and right for example. For a lot of people it can be a good start to moving their body a bit more.

If you go running every other day you don't need it, I'll give you that.