Clinical Research Directory

Inclusion Criteria: * English speaking (\>18 years old). Daily messages will be sent in English. * Acute PE with right ventricular enlargement or dysfunction defined by echocardiogram report, CT Angiogram report, or elevated cardiac biomarker (NT-pro BNP or troponin). * Baseline testing started within 7 days of hospital discharge. Exclusion Criteria: * Pregnancy. * Cardiac Effort \>2.5 beats/m during 6MWT. This is for safety. * Cardiac Effort \<1.2 beats/m during 6MWT. They are unlikely to benefit. * Resting tachycardia \>120 beats/m during screening or at hospital discharge. * Suspicion for Chronic Thromboembolic Pulmonary Hypertension. * Systolic blood pressure \>180 mmHg during screening or at hospital discharge. * Inability to walk. * Estimated prognosis \<12 months at the time of discharge due to underlying co-morbidities. * Advanced neurologic disease. * Lack of access to email or text messaging. * Inability to follow daily instructions. * Participation in a structured exercise routine at least three days per week in the prior four weeks. * Principal Investigator discretion