Like the Muscle Cramp, S.S. is attracted by sudden movement and warming bodies. It has a love for the spleen, the liver and the midriff. As soon as the blood starts flowing faster due to your bodily strain, it tries to rip apart the blood vessels in quick successions.
How to fight it
I think, the S.S. is mesmerized by the sudden plus-activity in your blood. Calm down, when the pain gets too strong. The more your bloodvessels and your midriff are used to exercise, the less likely a S.S. will notice your strain. gab