When we breathe, the body absorbs 21% of oxygen from the air. Under normal circumstances, that is adequate for what the body needs to saturate the red blood cells. The red blood cells then transport the oxygen to the rest of the cells in the body. Oxygen is essential for proper cellular function.
Numerous studies show that the cervical spine undergoes abnormal motion that exceeds the physiological range of the joints. This video demonstrates this abnormal motion and shows how it can cause ligament injury.