Position yourself standing in a corner with your back to it, or with a wall, chair, or sturdy object near you. Pick up one foot and balance on the leg that is in contact with the ground on a foam pad or unstable surface like a pillow. While maintaining your balance, turn your head horizontally side-to-side .
You should feel like your balance is being challenged. You will also feel your foot, arch, calf, and hip muscles challenged here.
Try not to lose your posture and excessively lean forward/backward or side to side. If you lose your balance it is ok, take a step and get back to starting position. Do not allow yourself to fall or take the risk of injuring yourself.