Good balance is essential to good dancing.
Keep your weight over the balls of your feet. Do not lean back or forward, except for some figures. In general, have a comfortable and stable position over your feet and be able to move in any direction instantly without having to drastically shift your weight to be able to move in the opposite direction - keep your feet close together on turns, don't spread eagle to be grounded, be elegant. Carrie Lucas can maintain her spins even when her partner is instructed to lead her poorly and try to throw her off. Followers who are more in control of their own weight can do more things - that's part of why people like Carrie can do that.