Inflate your wobble cushion according to the manufacturer's instructions. For most wobble cushions, insert the end of a hand pump and pump the cushion up until firm. Remove the pump and insert the valve closure to seal it off.
Place the wobble cushion on a chair. Choose a chair without arms to prevent you from using the arms as support. The goal is to work on strengthening and chair arms act as a crutch, preventing the strengthening.
Sit on the wobble cushion and place your feet flat on the floor. Bring your feet together. Allow your knees to fall to the side. Adjust your balance as the center of gravity shifts while sitting on the cushion.
Move the wobble cushion to the floor and place your feet on it. Slowly rotate the cushion clockwise 20 times with your feet. Reverse direction and slowly rotate 20 times counterclockwise. This will help your leg muscles.