Do this exercise and then write about what it was like.
Pick a number between 8 and 20.
Sit comfortably with your back supported. Close your eyes and pretend that there is a search light shining into the sky from the top of your head. Move your head in slow circles, pretending that you are drawing circles in the sky with the light saber you are wearing on your head.
Whatever that number was that you picked at the start, draw that many circles. If you lose count, start over.
Draw all the circles in one direction, and then reverse and draw them in the other.