Side stitches: cause and cure
In addition, most runners are “footed”. They begin and end a respiratory cycle on the same foot while running… As the runner’s breathing then becomes synchronized with his/her stride, exhalation consistently occurs on the same leg. If one repeatedly exhales (causing the diaphragm to move up) when the right foot hits the ground (forcing the organs on the right side of the body to move down), a side stitch may develop.
OK, this is something new I learnt. don’t know why all these years, i never find out what the hell causes stitches and i didn’t know that exhalation occurs on the same leg!
