I trade while laying down on the bed or sitting down on a chair. I have never tried doing it standing up. But what I do I feel most comfortable while laying down on the bed. It is more comfortable for me and whenever I feel exhausted I just lay on my back and take some rest. You can call me lazy but I enjoy it.
But in terms of standing or sitting on a chair, I think standing will be good rather than sitting. On the long hours that I spend sitting, sometimes my body hurts in different places. And it's not about good chair or something, if you sit for a long time it will hurt. Keeping that in mind, given the choice I have between sitting and laying down, I prefer laying down on the bed. I have seen many interesting replies about standing and working. So I might give it a try in the future if I get a chance. Seems interesting.
Trading while laying down on the sofa while "watching" something is where I do most of my trading as well. It doesn't require this much professionalism like standing desk or something because we are not professional traders and it shouldn't be a big deal.
I think it is quite important to remember that the more we do it, the better we are going to get and we are going to have some sort of result that would be a bit harder. I know that it will not be all that simple, but if we could make it work somehow then it is going to end up being a greater return. I know that "having fun" is a very important part of trading, you can't just consider it like a job, I mean some people are actually professional traders, they could, but not us.