I still don't know why my whole body would move in rhythm back and forth gently when I sit on the floor crossed leg and maintain natural posture.
I felt the same thing too once while kneeling down. The whole body would swing back and forth in rhythm slowly. Sometimes I think I feel it even when sitting down on the chair though I think that's only because I was just feeling it too much.
I can always stop it at will so it's not a big bother but still it's kind of funny.
