Life can be stressful. When it is, we respond by becoming ‘shallow breathers’ taking short shallow breaths without filling up the entire lung and chest cavity. We breathe using just a portion of our full lung capacity. We do this unconsciously in response to stress or even intense concentration. Unfortunately, as a result we reduce our vital lung capacity and the amount of oxygen that is available to our system, including our brain. This can cause headaches, impaired alertness and fatigue. When the brain does not receive enough oxygen, all basic functions are affected including concentration and memory.