Physical exercise decreases the risk of coronary heart disease events, however strenuous activity can potentially raise the risk of sudden cardiac death and acute myocardial infarction in vulnerable patients. The risk of a cardiac event increases with the intensity and duration of the exercise. In otherwise healthy individuals, the risk of suffering a cardiac event during exercise is low but it should not be ignored due to its potential consequences. Patients who suffer a cardiac event while exercising should rest until their condition stabilizes before continuing with their regular activities. If at any time they experience symptoms such as chest pain or shortness of breath, they should seek medical attention immediately. Patients who are considered to be at high risk for a cardiac event should not engage in intense physical activity. They should perform moderate-intensity sports that do not cause undue fatigue and are activities that they enjoy. High-risk patients should also follow up with their physicians before beginning an exercise program. Cardiac rehabilitation is a supervised program designed to reduce the risk of cardiac events by promoting a healthier lifestyle. The goals of cardiac rehabilitation include improving cardiovascular health, reducing the risk of future cardiac episodes, and enhancing quality of life. Cardiac rehabilitation typically includes exercise training as part of its core components. Other aspects may include education programs, nutritional counseling, and psychological support.