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Keep your belly button pulled toward your spine, tighten your core, and maintain a straight spine throughout the movement. Avoid neck flexion and move through the full range of motion to prevent injury and get the most from the exercise.

Keep your belly button pulled toward your spine, tighten your core, and maintain a straight spine throughout the movement. Avoid neck flexion and move through the full range of motion to prevent injury and get the most from the exercise.
Breathing. Belly button to spine, core tight, spine is straight. Don't bend your neck. All the way down.