A fat farm where the overweight can commit themselves until they have lost enough weight to fit through the custom set opening in the jail cell door.
The hole in the door is adjustable and has a key shape so the skull can get through anytime.
Guards/nurses/attendants keep the voluntarily self
committed inmates from injuring themselves.
The tv only works if the treadmill is in motion and meals follow whatever diet guru the inmate has cast his/her lot with. Plenty of water and doctor on call.
And when they can pass the door, they can leave.
THEY PICK THE TARGET DOOR SIZE, AND there is no JAZZERCISE. What is cruel about that ?