Neck de - tenser4 lie on your stomach elbows on floor . with eyes closed cup chin with your left palm and support the back of your head firmly with right hand . very slowly twist your head to the right . hold for a count of 10 . slowly turn head back to start position 慢慢地将头扭向右边，保持这种姿势，数10下，然后慢慢将头转回原位。再换成右手掌托住下巴，左手扶着头后部，慢慢将头扭向左边，数10下。
