So this is happening now in my games but.. every sim, as long as I have full autonomy on starts to do some kind of exercising even if I have them doing something else! Like if they are watching tv or ...
Havent noticed it, probably it's NAP related? Only my sims who has active trait exercise autonomously but they toned that down it seems, previously they exercised religiously. now just once a day and I like it this way.