Sit up straight in a chair and hold both arms out to your sides at shoulder height.
Ensure your weight falls through your seat bones, your back is straight and your gaze is directly ahead.
Make a thumbs up with both hands.
Turn your head to look at one hand while simultaneously giving a thumbs up in this hand and a thumbs down in the other.
Rotate your head the other way to look at your other hand, changing your hands to give a thumbs up in the hand you are looking at, and a thumbs down in the other.
Repeat this movement at a steady pace.
