If you have atrial fibrillation, there are some things you should avoid doing. First, you should not smoke. Smoking can increase your risk of developing blood clots, which can lead to stroke. Second, you should avoid drinking alcohol in excess. Drinking too much alcohol can also lead to blood clots and stroke. Third, you should avoid strenuous exercise. Exercise can increase your heart rate and put strain on your heart muscle, both of which can trigger an irregular heartbeat. Finally, you should avoid stress and anxiety. Stress and anxiety can also trigger an irregular heartbeat. If you have atrial fibrillation, it is important to talk to your doctor about what activities are safe for you to do and what activities you should avoid.