Looking back  

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Instructive:
 

Keep your shoulders relaxed. Looking straight ahead  tilt your head down. Then slowly stretch the  neck back, gaze slightly upward.

Lower your head again looking straight ahead and  repeat.

With your shoulders straight and your gaze straight ahead, bring the  ear to corresponding shoulder. Bring your head to the center  again, and without stopping the movement, bring the other ear to  its corresponding shoulder.

Repeat. From top to bottom,  draw with the jaw an imaginary line from top to bottom  down.

Always looking straight ahead, draw the same line  from bottom to top and repeat.