Technology-Based Intervention to Promote Heart Health After Cardiac Rehab (Mobile4Heart)

Inclusion Criteria: * At least 18 years of age * History of cardiovascular disease that qualified patient for cardiac rehab (i.e. ischemic heart disease, history of unstable angina, systolic heart failure with ejection fraction at 35% or less, and Class II to IV symptoms, coronary artery bypass graft surgery, valve replacement) * Own a smartphone or tablet Exclusion Criteria: * Cognitive impairment * Lack of English proficiency/literacy * Clinical conditions including: unstable arrhythmias, aortic stenosis, thrombophlebitis, dissecting aneurysm, symptomatic anemia, active infection, uncontrolled hypertension (resting diastolic \> 100 mmHg, systolic \> 180 mmHg), decompensated heart failure NYHA class 3-4, current unstable angina, 2nd or 3rd degree heart block, or uncontrolled high grade exercise-induced ventricular ectopy