During normal expiration, your lungs will start to deflate as your inspiratory muscles relax. However, during periods of active breathing, such as exercise or coughing, your expiratory muscles may contract to force air out of your lungs. Therefore, training your expiratory muscles will help to improve their strength and function.
When you inhale your diaphragm muscle contracts and moves downward and your intercostal muscles (the muscles between your ribs) contract, pulling your rib cage upward and outward to allow your lungs to expand. Effort is required. When you exhale, your diaphragm and intercostals relax and your lungs deflate. Exhaling normally requires no effort from your body unless you have a lung disease or are doing physical activity, in which case your abdominal muscles will contract and push your diaphragm against your lungs to push the air out of your lungs. Reply
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