How fast is your heart rate going? How old are you? An incredibly high heart rate during exercise (i.e., routine exercise that a normal person would not go greater than 170 bpm) or a failure to return to below 100 bpm within 2 minutes of stopping exercise can be a sign of early cardiovascular disease. The shortness of breath concerns me. Yes, it's ok to get a little short of breath during exercise, but you should still be able to carry on a normal conversation.