I think you need to find a way of NOT standing still in one position, and practise whatever helps you to do that.
When you are standing chatting to someone you do move about a bit - you move your head around as you speak or you nod it or shake it at what the other person is saying, and you shift your weight from one foot to the other, or turn to look at someone walking past. You are not aware of it, as you are interested in the conversation.
Having the dog with you is another thing to make you move about. However obedient and quiet the dog is, they do move around themselves, making you turn to see what they are doing, or speak to them to praise them or to correct them. that is enough to break the spell of being immobile.
Perhaps you could get into the habit of not standing still at one thing, like washing dishes at the sink, for more than a few minutes at a time? Remembering to shift from one foot to the other or to raise and lower your arms a few times at frequent intervals could make a big difference. Singing to yourself as you work would make you move in time to the music - like doing a dance without leaving the spot. Playing a radio would give you rhythm to tempt you to move, too.