Hello, and welcome to HCM! This is certainly not normal. As you may know, hypertrophic cardiomyopathy puts you at significantly increased risk of sudden cardiac death. Because of this, you should take any heart symptoms (such as chest pain, palpitations, dizziness, fainting, shortness of breath, shooting pain or numbness) very seriously, especially when they occur during exercise. Make an appointment to see your cardiologist as soon as possible. As you said, your defibrillator is a good insurance policy , but this still needs to be evaluated promptly. I wish you good health, and thank you for posting on HCM!