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Normally during exercise, blood pressure increases to push the flow of oxygen-rich blood throughout the body. However, in some individuals, the response to exercise is exaggerated. Instead of reaching a systolic (upper number) blood pressure of around 200 mmHg at maximal exercise, they spike at 250 mmHg or higher.
Your heart rate increases when you exercise. Photo Credit Jupiterimages/Stockbyte/Getty Images. Your heart rate increases when you exercise, because you are working harder. How much your heart rate increases depends on the intensity of your exercise and how fit you are. Exercise experts differ on how high your heart rate should be during exercise, but they agree that it needs to be substantially higher than your resting heart rate to improve your cardiovascular fitness.