 i. What differences in changes of QOL scores, as measured by the Peds QL 4.0 Pediatric Quality of Life Inventory and the CFQ-R Cystic Fibrosis Questionnaire - Revised are found in youth and young adults with CF between the group receiving MT and control group? What changes in QOL scores in each group are found over time? ii. What differences in changes of musculoskeletal pain, as measured by the Numeric Rating Scale for pain are found in youth and young adults with CF between the group receiving MT and the control group? What changes in pain scores in each group are found over time? iii. What differences in changes of the pulmonary function are found in youth and young adults with CF between the group receiving MT and the control group in terms of the following: 