The fourth and final task is to balance on one leg. This task is performed twice, once on each leg, if you are able. If you are not able to balance on either leg, you may do the task twice on the same leg.
You should raise one leg so that your foot is about 6 inches off the floor and you should hold the device on the same side as the raised leg. Your arm that is holding the device should be bent as if you were holding the device up to look at. You should hold the device as steady as possible.
You will do this for 15 seconds and then change sides or simply repeat.