In multicellular organisms, the body is a system of multiple interacting subsystems. These subsystems are groups of cells that work together to form tissues and organs that are specialized for particular body functions. The ALA recommend two different breathing techniques for people to try: pursed lip breathing and diaphragmatic (belly) breathing.

https://www.health.harvard.edu/mind-and-mood/relaxation-techniques-breath-control-helps-quell-errant-stress-response Lewis (2004) suggests keeping your spine erect yet supple, opening up the spaces of your body. Take deeper breaths, expanding the abdomen then chest to increase the amount of air you take in. Visualize your body filling and emptying itself of air, following each breath with your body and mind. When our breathing is free and natural, so is the movement of our belly. Allowing your diaphragm to move deeper into your abdomen can improve your ability to breathe fully and deeply (Lewis, 2004).People who have respiratory conditions such as asthma or chronic obstructive pulmonary disease (COPD) can take further precautions to protect their breathing and lung health.

Paulus MP. The breathing conundrum-interoceptive sensitivity and anxiety. Depress Anxiety. 2013;30(4):315–320. doi:10.1002/da.22076When we are experiencing acute stress, the sympathetic system takes control and the vagus nerve is inhibited. High and sustained “vagal withdrawal has been associated with high self-reported levels of stress, anxiety, and depression” (Cuddy, 2018, p. 189). However, people should try to begin practicing breathing exercises when their breathing is normal — not while they are experiencing shortness of breath. Mindfulness helps us remain in the present moment. It is a powerful tool for reducing the sense of struggle and managing stress (Khazan, 2019). sinus: Hollow space in the bones of the head with small openings that connect to the nose. The sinuses help regulate temperature and humidity of incoming air, as well as serving to lighten the bone structure of the head. nose: The primary and preferred entrance of outside air into the respiratory system. The hairs inside the nose serve to clean the air of particulates before it enters the deeper parts of the respiratory system.

Alternate nostril breathing has been shown to enhance cardiovascular function and lower heart rate.However, breathing through the mouth is sometimes necessary if a person is exercising or has sinus congestion. Use the belly