Stand in front of a clear open space.
Hold a ball in your hand, about the size of a tennis ball.
Walk forward whilst you throw the ball up and over to the other hand, in an arc.
Catch the ball with the other hand.
Maintain your gaze on the ball at all times and allow your head to track the ball's movement.
Continue walking and tracking the ball's movement as you throw it from one hand to the other, for the prescribed duration.
