Our expert says:
It depends on the heart condition, I guess, the obvious danger is myocardial infarction, which is the medical way of saying that the heart doesn't get enough blood and then part of the muscle dies from a lack of oxygen. This is the common heart attack, and of course the risk exists that exercise, which places more demand on the heart, will expose any underlying problems. The first symptom will be breathlessness, and then chest pain, called angina of effort.
Having said all this, you have to still keep in mind that exercise is still benefical for people, but again, it all depends on the problem. I have assumed that it's coronary artery disease or some problem related to blood flow to the heart, but it can very easily be some other congenital defect and so the key, absolutely vital is that you must be in consultation with a doctor before you start and then the first few exercise sessions must also be supervised. It would be reckless to go any other way.
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