[Self-resistance head tilt] mainly exercises the neck.
Stand your legs naturally shoulder-width apart (or sit on a stool), tilt your head forward, cross your hands behind your head, then tilt your head back hard, and press forward with appropriate force with both hands.
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Inhale at the same time. When the head is tilted back to the limit, pause for 2 seconds. Apply a little more force with both hands to press the head against the chest bone, return to the ready position, and repeat 10-20 times.
Move slowly and do not use too much force on your hands to avoid neck injuries.
