I had more of a problem when I started out and when I first got to know them. Now I get up and sit on the floor randomly if I want or just play with random things around the room.

I got there I guess by getting more comfortable with them. I needed to know they wouldn't leave me if I did something they disliked. We just talked about things I like that makes me feel comfortable and worked up to stuff that made me uncomfortable. And we know each other. I know how she'll react before I do anything. I think asking for permission at first is fine. You have to get a feel for how she handles stuff before doing anything else.

I have a problem with apologizing too much. It's different but kinda similar because coming in and redirecting yourself to just a small space, looking one specific place, being all tight like that is being apologetic about you being there. I used to always sign my emails off to LCM with "I'm so sorry". She eventually told me to stop
It with the sorry so I signed off the next email with "you're welcome" in a sarcastic kind of way. The strange thing is that changing that one thing made me feel less apologetic. I am grateful and thankful and I thank her all the time, but I apologize less.

Maybe challenge yourself to look at a new thing every session?