Do you even lift, bro?
One of the most alarming things for me when this game first came out was how quickly all of my played Sims got rather ... large. I mean, no matter what they did all of my sims gained a lot of weight...
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I use RoBurky's "Fitness Controls" mod to slow the rate of change way, way, way, way down, because it happens much too fast if you are playing with aging turned off, and I prefer my sims to more or less stay looking the way I originally made them.
