Stop the Dreaded Side Stitch
Regulate your breathing. Run like a swimmer�with efficient breathing patterns that are in sync with your body. Swimmers can only breathe when their faces are out of the water (obviously), so they focus much of their time learning their breathing tempo and matching it to the rhythm of their stroke. Runners can benefit from the same technique by matching their breathing to their strides�inhaling for two to four strides and exhaling for the same. The faster the pace, the shorter the sequence (fast pace = one or two strides per breath, slower = three or four strides per breath). This can not only prevent stitches, but also improve the efficiency of your oxygen transport. Plus, it's a great way to keep in touch with your running effort levels without a watch.
Slow down and exhale to release the stitch. If you still get another side stitch, implement this strategy and it will go away in seconds (I promise). Slow your pace and exhale as the foot on the opposite side of the stitch strikes the ground. This doesn't mean every time that foot hits the ground, but as you exhale, do so in sync with that opposite side. When you exhale, you use the muscles of your diaphragm. When this happens in unison with your foot striking the ground, the impact forces travel up the body and through your core (your side too) and exacerbate (piss off) the muscles in spasm creating that stitch. When you change the side of the landing forces to the opposite side, the tension causing the stitch releases. For example, your stitch is in your right side. You slow your pace, and exhale as your left foot is hitting the ground. Voila! Side stitch is history and you're running without swearing once again.