modular_aphelion/modules/fitness/code/fitness_prefs.dm 
| /datum/preference/toggle/muscles_automatic | Whether a character's muscles follow their stats: dexterity their definition, strength their size. Neither stat exists yet, so while they do, the character's muscles are Normal-sized with no definition. |
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| /datum/preference/numeric/muscles | A character's muscle size or definition, picked while their muscles don't follow their stats; shown on a slider, with each step's name. One for the whole body. Applied before species, as the leg shape is, so a species change builds the limbs at it; with the species unchanged, the limbs are swapped here. |