What happens to your heart rate when exercising?

Heart rate is the number of heart beats recorded per minute. An average heart rate while exercising is measured while doing a workout. My body's heart rate decreases after an exercise which is called recovery heart rate. The heart rate goes high after heavy exercise. When I exercised, my body's working muscles required additional stores of oxygen to help fuel its energy requirements. My body got oxygen from the lungs and transmitted it to my muscles through the bloodstream. My heart controlled the flow of blood throughout my body and my heart rate was a quantification of that flow. So when my muscles were working harder and needed more oxygen, my heart rate increased. The harder I worked, the faster my heart pumped.