If most of the work of breathing is done by the inspiratory muscles, is there any point in training the expiratory muscles?

2 thoughts on “If most of the work of breathing is done by the inspiratory muscles, is there any point in training the expiratory muscles?”

1. Why is the inhale difficult and the exhale so easy then?

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   1. 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.

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