Dear Sir Thanks for writing to us. Sedentary life style is the most common cause for rapid rise of heart rate following initiation of exercise. Other causes may be anemia, heart disease, lung disease or any significant systemic illness can cause this. I would like you to be seen by your general physician first, as many of these conditions can be ruled out by simple examination. Thereafter, if required, you may take a stress test under physician supervision to ascertain your exercise capacity and reasons for your symptoms. Hope this helps. Sincerely Sukhvinder