>>82104375
>Everybody over a certain BMI could be put into a gym prison that you can only escape by getting in shape.
Actual brilliant scifi short story concept, could be worked to multiple angles and sold to all kinds of media retards in the fitness debate.
>Alternatively I wonder what would happen in a world where fit people had to be naked but fat ones had to wear clothes
Not viable, or everyone gets really fat. Clothes are ingrained in humanity's shared culture as a status symbol. It would be incompatible with society, or otherwise a hierarchy would be created based around like, chubby bitches in lingere and whatnot.