Inclusion Criteria:  Adult participants (≥ 18 years of age) New referral to the standard of care rehabilitation program Diagnosis of hEDS based on the 2017 diagnostic criteria or diagnosis of HSD (defined as generalized joint hypermobility, chronic pain, and systemic findings to suspect connective tissue underpinnings) with clinical verification by the EDS medical team  Exclusion Criteria:  Genetic testing confirming the diagnosis of another type of EDS (i.e., vascular EDS, classical EDS) Any contraindication to exercise testing (i.e., unstable cardiac disease). Presence of cardiac pacemaker/implantable defibrillator or structural cardiac abnormalities on echocardiogram Recent respiratory infection (< 1 month) or known diagnosis of obstructive (i.e., asthma, chronic obstructive pulmonary disease) or restrictive parenchymal lung disease History of pneumothorax, otitis media (fluid behind the ear drum), or rupture of tympanic membranes given risk with IMT Recent participation in formal exercise training or IMT program (within the last 3 months) Persistent symptoms or difficulty tolerating IMT (i.e., breathing difficulties and/or chest pain) Diagnosis of severe autonomic dysfunction or postural orthostatic tachycardia syndrome limiting daily physical activity or exercise Neuromuscular disease (i.e., myositis, diaphragm paralysis) that may interfere with IMT Insufficient English fluency to provide informed consent or ability to follow study protocols Self-reported pregnancy Inability to connect to the internet