Neck flexion is the action of moving your chin down toward your chest. Even though this is a simple motion, it’s possible to develop pain, tightness, and decreased mobility in this area. Learn more about neck flexion, plus exercises to develop strength, improve posture, and increase your range of motion.
Sitting Neck Flexion Stretch - Video Guide
Side Bending (Lateral Flexion) For Back Pain
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Evaluating Neck Mobility - Flexion, Extension, Rotation, Lateral Flexion
Can parameters of the helical axis be measured reliably during active cervical movements? - ScienceDirect