strange finding

was dozing off in the morn while trying to read my health psych on management of chronic illness, so i stood while reading. was getting bored and restless so i began to move my hips around. surpisingly, in a particular circular motion of the hips, i could hear some air shuffling sound. tried a few times more and my body hurts. it seemed the motion kinda twist my stomach or lungs in a way that it pushes air out of my mouth, which i could feel, though slight. scary finding, like something's wrong with me.