i agree, its a bit jarring and offputting to see a character that SHOULD be immobile still walking and even running around. it would be neat if they get immobile and if you wanted them to lose weight, they could do arm exercises and once they gain more mobility they can do like walking and whatnot.
Or there could even be dedicated exercise rooms added in a potential 1.3 from generic ones to a massive swimming pool to even the whole ocean. (The inspiration actually came from a Mario-themed comic on DA by SweetnessAdmirer where the final page shows the primary focus character, Princess Peach, being placed in an olympic-sized pool to start her exercise.)