HOW: Take an all fours position on your hands and your knees. Hands underneath the shoulders and knees under the hips. Lift the knees off the ground. Let the head and neck flex down. Take a chin tuck position. Raise the head holding the chin tuck until you can no longer hold the chin tuck. Drop the head back down to repeat.
FEEL: You will feel the front of the neck and the back of the neck working.
COMPENSATION: Keep the chin tucked throughout the motion. Avoid shrugging the shoulders.