No it is not about gaining weight. Rather the opposite. Recently I have spontaneous moments of realizing that I have a body. And realizing how it it feels. How it would feel for someone to touch me. How I would look to someone when I am walking. I guess that is how it feels to be in one's body.
I have noticed that expressing emotions through singing comes much easier when I am in my body. I still have not had a chance to deliberately apply it to improv. It is easier to calm down the anxiety when I am surrounded by people who I feel may judge me when I get into my body. When I think that I take only as much space as my body does.. everything becomes so much less threatening and not directly affecting me. I feel I matter merely because I materially exist. I feel that other people will notice me and count with me only because I materially exist. I feel I do not need more. I feel that it is already a lot.