The Air When It's Right

It's like you're standing on a huge piece of ice that have just cracked off of a frozen surface of the ocean.
Your job is to keep your body stable on the piece of ice. You have to make sure that you are able to stand on this ice for... as long as you can imagine. Otherwise, the ice may flip over and that's the end of you.
Your life depends on it.

You are able to move the top part of your body all you want, but if you are not grounded on your waist down, that's the end of you.
You must make sure that the top half of your body stays as comfortable as possible. Otherwise, you may be wasting your breathing energy by placing unnecessary tension the top half of your body. The most common area for tension is around the jaw and tongue. Singers like to manipulate the sound with the mouth and jaw area. Instead of trying to create the sound, the singer must allow the breath to support the sound at the right place. You can pace your breath, but you can't control or manipulate it. It must still feel natural and just right.

Easy to say, very difficult to do.

One way or another, just remember that when singing, hips down must feel connected to the floor. Waist up is uncontrolled, fluid, and movements are guided by the hips down.

Hope this helps.

Cabbage Wabbage