Body Potential?

"Piperbird1;13508882" wrote:
Sorry to necro this thread a little, but I am also trying to get this.

I do not want my sims to be all muscular, is this the only way to complete this? And is there a non-cheat way to make them not muscular after?

I use a mod that prevents sims from losing weight, gaining weight, including building muscle and it doesn't matter if they work out. If you are interested then I can link the mod.