Hi doctor i was wondering if i were to exercise and have a panic attack would that be dangerous? like would my heart explode?

If you are having panic attacks, these can be handled. Contact your doctor and consider potential solutions

Please get a proper diagnosis & treatment. I recommend the Minnesota Multiphasic Personality Inventory Second Edition Clinical Interpretative Report since it result in a computer printout with diagnoses, treatments & prognosis. I have a dear friend whose son had a panic attack while driving due to side effects of the medication he was taking for anxiety & depression. He crashed into a cement wall.

Your question suggests that you MAY have a health phobia. Please see a clinical psychologist who can evaluate the situation and treat accordingly. Peace and good health.