What is the heart’s job during exercise? Is the goal of exercise an increase in performance and conditioning or is it to get the he

What is the heart’s job during exercise? Is the goal of exercise an increase in performance and conditioning or is it to get the heart rate up? How are each of the following affected during higher (70-90% VO2max) and lower/moderate (40-70%) intensity exercise – heart rate, blood pressure, cardiac output, heart rate variability, and ventilatory control? What is the ideal expectation/benefit to each of these when performing the “right intensity” (for the individual) of exercise.