Both of them do not affect trading directly, but rather on the trader’s decisions, which if they are affected by psychological factors such as trading after eating, or in the morning, or after the end of work, or before sleep, you need to control your emotions, as the greater the conviction that doing a certain psychological thing before trading means that you will make profits is a big mistake.
Well it might have an effect for others not all of us. Psychological effects may affect our decision making, it depends on how we frame it. I guess standing/sitting may affect you trading game, because if you think about it, sitting is where your body is relax so as your mind, so you are be more in a loosen state whereas standing, OP have a point, you are more alert. I think this is the same as trading with a personal problem or do not have any. Although this may affect your trading style, or decision making in trading, it is just a little thing to discuss about and just do what you prefer and feel about with yourself.
Get a place with good lighting and a comfortable chair, and you can think about trading decisions while walking or running according to the way you find suitable for you to think and make appropriate trading decisions.
In short, trade in your calm state, this way your mind is more efficient in processing and analyzing information.