The document discusses the benefits of exercise for patients with cardiovascular diseases like coronary artery disease and heart failure. It outlines that regular physical activity can decrease mortality by 20-30% and improve blood pressure and quality of life. Exercise is shown to have greater benefits than procedures like PCI. Guidelines recommend 20-30 minutes per day of moderate intensity exercise for secondary prevention after a heart attack. The document also provides recommendations on exercise prescription, including frequency, duration, intensity and progression. It notes contraindications and risks but states risks are low in supervised programs.