When I go up a bit in weight in unhealthy ways (holiday season "diet"), I am very quickly punished and reminded of my unhealthy ways by some emergent midsection jiggle while running. Needless to say I hate it, and it goes away in no-time. It's gross, and all that energy that goes to waste for jiggling fat and skin around!! Now think you have a few hundred freaking pounds of lard to jiggle around at every step. Blows my mind. If you managed to jog (which you wouldn't), some of the jiggling lard would probably break the sound barrier!