I read adrenaline can cause sudden cardiac arrest during physical activity. How do you know if your workout is safe? And, can emotional stress cause sudden cardiac arrest? I struggle with anxiety and am worried about this.

Don't worry. Sudden cardiac arrest during exercise and physical activity is almost always due to a congenital (from birth) electrical problem in the heart. If you are concerned, your doctor can run a simple ECG to identify whether you are at risk. .