Abstract: A method of developing the accessory muscles of the upper torso utilizes a therapy device having an adjustable compressive wrap that wraps around the chest of a patient. The wrap is made of a substantially elastic material, such as neoprene, and has a releasable fastener to removably attach the wrap to itself around the patient's chest. The device may have one or more markers attached to the wrap to indicate to a therapist where the attachment device should be attached to achieve the desired compression around the chest. The therapist places the device on the patient and tightens the wrap until the therapist determines, by observing the rise and fall of the patient's chest, that the device has activated the patient's accessory muscles. The patient wears the device at this tension for about two hours per day, at least six days per week, for the first two weeks.