These six Pilates moves strengthen the diaphragm, stretch tight muscles, and improve posture—all of which help you run longer with less effort. Practice each exercise two or three times a week before ...

Your diaphragm is a thin muscle that separates your chest and abdomen. When you inhale, your diaphragm tightens and expands your chest cavity. A paralyzed diaphragm doesn’t tighten as it should when ...