When you are practicing, try moving with the music. Then try moving in counterpoint to the music, i.e., movements that are ongoing and easy, but not tied to the beat. Try slow, large movements, and smaller, quicker ones – all while singing. How does it feel physically? What is different? What does it do to your mood to sing while moving compared to standing still?
What are some movements that go with the character of a song you are singing? What kinds of songs may ask for more movement, and which want less?
Sing a phrase moving, then the same thing staying more still.
“Groundedness” and “stability” are popular terms, but what do they mean in relationship to a physical world that is composed mostly of the space between atoms, on a planet that is twirling at about 1000 miles per hour at the equator, in an expanding galaxy?