Heart rate shows how many times your heart beats in one minute. It helps us understand how well our heart and blood vessels are working. Many things affect heart rate, like how active you are, how you're feeling, and even the weather. Keeping an eye on your heart rate can tell you about your fitness, stress, and any health issues. Your body uses a bunch of different systems to control your heart rate, like your nervous system and hormones. Is 120 heart rate normal? It's norma