Cardiac Rehabilitation for Patients Receiving Radiation Therapy for Thoracic Cancers

Inclusion Criteria: * Pathologically confirmed or radiographically diagnosed non-small cell lung cancer, small cell lung cancer, esophageal cancer, Hodgkin lymphoma, non-Hodgkin lymphoma, sarcoma, thymoma, or left-sided breast cancer. * Planning to receive neo-adjuvant, adjuvant, or definitive radiation therapy to the thorax with curative intent. * Willing to participate in home-based cardiac rehabilitation program and be monitored remotely via smart phone application * Possess a smart phone or tablet capable of supporting teleHeart application * Willing and eligible to co-enroll in the Cardiovascular Toxicity in Cancer and Improvement in Recovery (SURVIVE) Registry Study (HRPO# 201801031). * At least 18 years of age. * ECOG performance status ≤ 2 * Ability to understand and willingness to sign an IRB approved written informed consent document (or that of legally authorized representative, if applicable). Exclusion Criteria: * Presence of distant metastatic disease (except patients with lymphoma). * Life expectancy less than 6 months * Patient lives in skilled nursing facility, chronic care facility, nursing home, or palliative care or hospice facility * Unable to walk * Presence of significant cancer disease burden that would make patient unlikely to tolerate cardiac rehabilitation (CR) * Diagnosis of primary cervical esophageal cancer. * Presence of unstable angina. * Recipient of heart transplant. * Patient on cardiac transplant list or has a ventricular assist device * Patient's baseline weight \> 300 lbs (due to weight limitations of the scale and bioelectrical impedance device) * Pregnant and/or breastfeeding. Women of childbearing potential must have a negative pregnancy test within 14 days of study entry. * Other medical comorbidities that make the patient unable to participate in the CR program or other assessments involved with this study.