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 ...

Just like any other muscle in the body, the diaphragm can also get “tight.” “Any kind of tightness in the diaphragm can limit the amount of breath we take,” Conroy says. “And it can also lead to ...