When you can do this without wobbling, you could try doing the same thing with your head turned to the left for 30 seconds (repeat for both legs), then the head turned to the right. The next stage is to close your eyes and stand on one leg (again repeat for both legs). Try having your head in a neutral …
The Fountain of Youth and Vitality
1Strong Women Stay Young, Miriam E. Nelson, Sarah Wernick, Bantam Books, 4 Apr. 2000