 Subjects that demonstrate unresolved BPDs upon reassessment after PT treatment, will have the option to participate in the second phase of the study. These subjects will be scheduled twice a week to receive IMT using the RT2 device and software program described in detail later. The IMT protocol uses biofeedback to train at a specific percentage of MIP and SMIP for each inspiratory effort. The program consists of 6 breaths per level, with 6 levels, and the ability to alter the rest time between breaths as the subject advances through each of the levels. The training session is completed when the subject fails to achieve the selected percentage of SMIP twice consecutively, or if they complete all 6 levels for a maximum of 36 breaths. The IMT program will be set at 60 of each subjects MIPSMIP and breathing at this workload will focus on full deep inhalations using diaphragmatic breathing followed by slow prolonged exhalations with each subsequent inhalation being signaled by the RT2 software prompt via visual display on the computer screen to Please Inhale. The first level of IMT will consist of a 40 second rest period between breaths followed by a 30 and 20 second rest period during IMT at levels 2 and 3, respectively. The rest period during IMT at the remaining three levels will remain at 20 seconds during which subjects will be prompted to prolonged exhalation throughout as much of the 20 second rest period as possible. The training session will also be stopped if the subject complains of increased back pain and if dizziness, fatigue, or if any other adverse response is noted. 