The diaphragm and intercostal muscles provide most of the effort of normal breathing, as well as the beginning stages of respiratory distress. As breathing difficulty worsens, accessory muscles ...

Tight hip flexors, especially a deep muscle called the psoas, can silently stress your spine. Here's why this muscle deserves more attention—and how to strengthen it.

I don't pay a lot of attention to my breathing, despite it being one of the most important things I do to keep my body ...

Asthma causes the airways to spontaneously constrict (narrow), making it difficult to breathe. An intercostal muscle strain involves the long, thin muscles that run between your ribs. Strains of this ...