Alternative balance activity:

Just stand on one foot and try twisting your torso from one side to the other or from from to back.

If this is too easy, carry a heavy object like a thick book. If this is unwieldy, try soup cans.

Vary your angular momentum by practicing torso twists with your arms out or your arms in or with varying weights.

Try the same while standing on the ball of your foot.

Try while reaching above your head, to the side, et cetera.