Hi, Usually heart rate rises with exercise. Actually it is good indicator if there is no chest pain or breathing difficulties. It denotes your heart can cope with increasing oxygen (blood supply) demand of body. Only issue that heart rate of 150-160 achieved with low grade exercise for short duration. It is more likely due to your body is not used to for such kind of exercise. You should follow graded exercise pattern which is suitable for you. Before starting heavy exercise warmup exercise is important. I want to know - 1) Any Associated conditions like Diabetes, high blood pressure, cholesterol problem. 2) Habits like smoking and alcohol. It is advisable for you - 1) Consult dietician for appropriate calories restricted diet containing adequate proteins, vitamin and minerals. 2) Consult cardiologist and get clinical Examination done. 3) ECG and 2DEcho will help in knowing the baseline heart condition.