To determine eligibility, all consenting participants will (1) undergo spirometric screening to rule out any indication of pulmonary pathology, (2) report they partake in athletic activity within a competitive environment (self-perceived/reported), and (3) complete the Dyspnea Index (DI). Participants with less than 80% predicted FEV1 on spirometry will be excluded from the study and referred to the pediatric pulmonary clinic at Massachusetts General Hospital (MGH). Anyone who reports they feel their sports-related activities are not competitive will be excluded. Participants in the E-PVFMD group who score less than 10 out of 40 on the DI will be excluded from the study, whereas participants in the at-risk group who score more than 6 out of 40 on the DI will be excluded from the study.