“Is exercise good for an irregular heartbeat?”

It depends on the type of irregularity. If it is atrial fibrillation then you need to be on slowing down drugs, but if the irregularity is simple ectopic beats (atrial or ventricular) and they don't worsen with exercise, then mild to moderate exercise is fine. Really hard exercise - iron man marathons are not good for the heart, no matter how fit it is. Best discuss with your doctor on what you have.  

Regards,

Gerald Lewis, MD