question: I am 52. I am fit and exercise 5 times per week.in the past 8 years I have had thyroid cancer resulting with the removal of my thyroid. 2 years ago I had hodgkins lymphoma and treated with chemotherapy and radiation. nevertheless I persist with my fitness regime. my problem is that I have a slow heart rate and have ended up in hospital twice.I am now waiting to see a cardiologist and have been advised not to exercise.  help