An exercise device assembly including an adjustable exercise device and a bed adapter is disclosed. The bed adapter may include a main body defining a first side and a second side. The main body may be provided with a first plurality of receptacles and a second plurality of receptacles that are for receiving and securing support members of the exercise device. In one aspect, the receptacles have a sidewall connecting the main body first side to a recessed support surface of the receptacle such that the support members of the exercise device are securely retained on the bed adapter.