Today, when I was doing standing side twists, (you basically stand, hips stationary and
you twist your upper torso from left to right, I felt air moving in and
out of my lungs, and
actually hear the whooshing sound, however no air actually expels from my mouth. It sounds like a bellows is in my chest and I feel the air pressure. It's scary because I"ve never had this happen before, and I've done this exercise numerous times. Is this normal or is it a sign of something more serious?