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To maintain a healthy heart, it is important to follow a balanced diet, get enough sleep, and engage in the right amount of physical exercise. Option 1, indulging in vigorous mental activities, while good for brain health, does not directly impact heart health. Option 2, playing games like carrom, chess, and cards, may provide mental stimulation but does not offer the same cardiovascular benefits as physical exercise. However, option 3, doing the right amount of physical exercise, is crucial for maintaining a healthy heart. Regular exercise helps strengthen the heart muscle, improve blood circulation, and lower the risk of heart disease. Option 4, doing sedentary work, involves minimal physical activity and does not contribute to heart health. Therefore, option 3 is the correct answer.