This exercise activates your core muscles whilst strengthening and co-ordinating the muscles of the lower back, pelvis, hips, knees and ankles.
Stand on a balance board with feet about shoulder-width apart, looking straight ahead. Ensure that you are within easy reach of some means of support, such as a chair back. Try and maintain your balance with eyes open for a count of 30, and then with eyes closed for a further count of 30, hands resting on or hovering just above the support.