Exhale is a term used to describe the process of releasing air from the lungs. It is the opposite of inhaling, which is the process of taking in air. Expelling air is an important part of the breathing process and helps to regulate oxygen levels in the body. Exhaling also helps to expel carbon dioxide, which is a waste product of metabolism. Exhaling is a natural reflex that occurs when the diaphragm contracts and the intercostal muscles relax, allowing air to be pushed out of the lungs.